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December 19, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct a 90% confidence interval for the mean IQ...
Thursday, December 18, 2014 at 6:16pm

statistics
find the area under the curve y=3log1.2x between x = 1.2 and x = 3
Thursday, December 18, 2014 at 5:46am

Statistics
What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.
Thursday, December 18, 2014 at 5:37am

Statistics
In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The ...
Wednesday, December 17, 2014 at 8:15am

statistics HELP!
A data set includes body temperatures of healthy adult humans for which 98.1F and s= 0.56F. What is the best point estimate of the mean body temperature of all healthy humans? Using the sample statistics, construct a confidence interval estimate of the mean body temperature of...
Tuesday, December 16, 2014 at 6:53pm

Statistics
Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall Street Journal, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in The Wall Street...
Tuesday, December 16, 2014 at 2:37am

statistics
There are three brands of milk for sale in a supermarket. Let's call them brand A, B, and C. A customer who purchases milk will choose brands A,B, and C with probability 0.6, 0.3, 0.1, respectively. Each day, the toal number of customers who purchase milk at this market ...
Sunday, December 14, 2014 at 1:15am

statistics
In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.8 and...
Saturday, December 13, 2014 at 2:40pm

statistics
A survey found that women's heights are normally distributed with mean 63.5 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with a mean 68.7 in. and a standard deviation 2.8. (a) Most of the live characters at an ...
Saturday, December 13, 2014 at 10:05am

Statistics
Use Bayes' theorem to solve this problem. A storeowner purchases stereos from two companies. From Company A, 550 stereos are purchased and 1% are found to be defective. From Company B, 850 stereos are purchased and 6% are found to be defective. Given that a stereo is ...
Friday, December 12, 2014 at 11:52pm

statistics finding the shaded region
Find the area of the shaded region. The graph depicts the IQ score of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The shaded region numbers are 85-120
Thursday, December 11, 2014 at 7:08pm

statistics probability
Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69 degrees C is ____
Thursday, December 11, 2014 at 6:38pm

statistics
The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
Wednesday, December 10, 2014 at 11:07pm

statistics
candidate #2 received 32% of the votes and candiate #3 received 14% of the votes, WITH a 6 % margin of error. what does this information tell us about the popularity of the candidates? 5
Wednesday, December 10, 2014 at 12:50pm

Statistics
why is this sentence false. a statistic is an event computed from a population.
Wednesday, December 10, 2014 at 12:26pm

Statistics
Hello Can you help me It is reported that 72% of working women use computers at work , choose 4 working wonen at random . Find the probability taht : A : all 4 use a computer at their work B : at least one does not use a computer at work Please help me 😞
Tuesday, December 9, 2014 at 12:50pm

Statistics
A card is selected at random from a standard deck of cards. Find the probability of randomly selecting a king given that an ace has already been selected.
Tuesday, December 9, 2014 at 12:17pm

Statistics
An ice cream store offers 10 toppings. If no topping is used more than once, in how many different ways can a four topping ice cream dessert be formed?
Tuesday, December 9, 2014 at 12:16pm

fuctions and statistics
one foot is equivalent to approximately 0.3048 meters. if a building is 65-feet long, what is the length of the building in meters, to the nearest tenth?
Tuesday, December 9, 2014 at 11:57am

Basic Statistics
The math grades on the final exam varied greatly. Using the scores below, how many scores were within one standard deviation of the mean? How many scores were within two standard deviations of the mean? 99 34 86 57 73 85 91 93 46 96 88 79 68 85 89
Tuesday, December 9, 2014 at 1:07am

statistics
Suppose you have information that the average stress score of students in online universities is 13.15. Using Minitab, compute a one-sample t-test to find out whether the stress scores reported by your sample are significantly different from those of the population of online ...
Tuesday, December 9, 2014 at 12:27am

Statistics and Probability
Mallory has a credit score of 680 and she is offered and interest rate of 8.3%. is this a good offer? Explain your answer.
Monday, December 8, 2014 at 10:38am

statistics
The HIM department has 200,000 active medical records and the department received 12,081 records requests during the year. The QI indicator of the HIM department is Eighty-five percent of records requests will be located within 15 minutes. Of the 12,081 records in the question...
Sunday, December 7, 2014 at 4:15pm

statistics
the hospital paper filing system contained 20,890 records. A total of 456 were identified as misfiled. What is the filing accuracy rate for the system? What is the percentage of misfiled records?
Sunday, December 7, 2014 at 3:33pm

statistics
1)According to past record the average daily sales for a sporting goods store was $3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample mean of 3655 with a standard deviation of $...
Saturday, December 6, 2014 at 5:03pm

Help with Statistics (T-value and decision rule)
For a random sample of 12 observations, the sample mean was 407 and the standard deviation was 6. Using the .05 significant level, answer the following questions. What would the t value be? What is the decision rule? **** I think the t-value would be t = -3.0845 Any help would...
Friday, December 5, 2014 at 8:52pm

statistics
Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this runner will complete this road race in 225 ...
Friday, December 5, 2014 at 1:50pm

statistics
A politician claims that she will receive 66% of the vote in an upcoming election. The results of a properly designed random sample of 145 voters showed that 80 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.01 level of significance? ...
Thursday, December 4, 2014 at 10:11pm

statistics
A class has 100 students, 70 of which are boys. 70% of the boys are involved in sports, while 40% of the girls are involved in sports. A student is chosen at random. If the student chosen is a boy, what is the probability that he is involved in sports?
Wednesday, December 3, 2014 at 10:46pm

Ashworth College
A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mean?
Wednesday, December 3, 2014 at 6:12pm

Statistics
A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mean?
Wednesday, December 3, 2014 at 6:11pm

Statistics
The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone and 10% do not own a cell phone. Fifteen students are to be ...
Wednesday, December 3, 2014 at 5:08pm

Statistics
1.A sample of 25 bottles is taken from the production line at a local bottling plant. Assume that the fill amounts follow a normal distribution. The probability is 90% that the sample variance is less than what percent of the population variance? 2. The amount of money spent ...
Wednesday, December 3, 2014 at 6:22am

statistics
Suppose an experiment consists of rolling a fair, six-sided number cube. What is the expected value of evens?
Wednesday, December 3, 2014 at 1:33am

Statistics
Assume that a procedure yields a binomial distribution with n=3 trials and a probability of success of p= 0.90. Use a binomial probability table to find the probability that the number of successes x is exactly 1.
Tuesday, December 2, 2014 at 10:18pm

Statistics
Four pairs of data yield r=0.942 and the regression equation y-hat=3x. Also, y-bar=12.75. What is the best predicted value for x=4.3? I know that the answer is 12.5, but how do you know to use the y-bar value instead of plugging the x value into the equation?
Tuesday, December 2, 2014 at 8:02pm

Statistics
The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation of 15 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side?
Tuesday, December 2, 2014 at 4:47pm

Statistics
At one college, GPA’s are normally distributed with a mean of 2.9 and a standard deviation of 0.6. Find the 70th percentile.
Tuesday, December 2, 2014 at 3:47pm

Statistics
The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation of 15 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side? Apply the 68-95-99.7 rule ...
Tuesday, December 2, 2014 at 7:54am

Statistics
A popular resort hotel has 300 rooms and is usually fully booked. About 4% of the time a reservation is cancelled before 6:00 PM deadline with no penalty. What is the probability that at least 280 rooms will be occupied? Use binomial distribution to find the exact value and ...
Sunday, November 30, 2014 at 6:05pm

Statistics
A recent study of US children under 11 years old found that they spend on average 142 minutes a day watching tv. Assuming normal distribution with the standard deviation of 44 minutes, answer the following. A) what percent of children of this age spends over 90 minutes per day...
Sunday, November 30, 2014 at 2:52pm

statistics
A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows: 1.3 7.2 4.2 12.5 6.6 2.5 5.5 Based on these results, a confidence interval for the population mean is found to be &...
Sunday, November 30, 2014 at 2:21pm

statistics
A 4 to 7 month old baby sleeps an average of 14 hours per day. At this age, babies sleep patterns follow normal distribution with the standard deviation of 1.6 a) is it unusual for a baby to sleep under 12 hours a day? b) In a random sample of 10 babies of this age,find the ...
Sunday, November 30, 2014 at 12:57pm

statistics
A 4 to 7 month old baby sleeps an average of 14 hours per day. At this age, babies sleep patterns follow normal distribution with the standard deviation of 1.6 a) is it unusual for a baby to sleep under 12 hours aday? b) In a random sample of 10 babies of this age,find the ...
Sunday, November 30, 2014 at 12:50pm

statistics
An air gap exists between fluids in a bottle and the cap of the bottle. At a firm producing olive oil, the gap is critical to the shelf life of their product. If the recent information reveals that the average gap is 9.46 mm with a standard deviation of 0.233, calculate the ...
Sunday, November 30, 2014 at 7:09am

statistics
A company has been studying the performance of their sales department. The measure of performance used is: average monthly sales amount in dollars. For the past 12 months, the average monthly sales amount has been $4,532 with a standard deviation of $386. Calculate the ...
Sunday, November 30, 2014 at 7:08am

Statistics
10 A color candy was chosen randomly out of a bag. Below are the results: Color Probability Blue 0.30 Red 0.10 Green 0.15 Yellow 0.20 Orange ??? a. What is the probability of choosing a yellow candy? b. What is the probability that the candy is blue, red, or green? c. What is ...
Saturday, November 29, 2014 at 11:10pm

statistics
What decision is reached when 'a' is greater than the p-value? When 'a' is greater than the p-value, the null hypothesis is rejected. Why is this decision reached?
Friday, November 28, 2014 at 5:59am

business statistics
10.55 Consider an experiment with four groups, with eight values in each. For the ANOVA summary table below, fill in all the missing results: Source Degrees of Freedom Sum of Squares Mean Square (Variance) F Among groups c - 1 = ? SSA = ? MSA = 80 FSTAT = ? Within groups n - c...
Thursday, November 27, 2014 at 1:28pm

Statistics
Suppose that hours of sleep per night for single adults between 30 and 40 years of age are normally distributed with a mean of 6.7 hours and a standard deviation of 1.1 hours. What proportion of adults sleep longer than 4.5 hours per night? (Report to 3 decimal places.)
Wednesday, November 26, 2014 at 6:36pm

Statistics 2 please give answers to the below ques
According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things are going in their lives is 0.82. Suppose that a random sample of 105 Americans is obtained. (Please answer the below and round to four decimals ...
Wednesday, November 26, 2014 at 10:10am

Statistics 1 plaese give answers to below question
Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) Describe the sampling distribution of p^ (choose the ...
Wednesday, November 26, 2014 at 10:02am

Statistics
For the following set of scores, fill in the cells. The mean is 70 and the standard deviation is 8. Raw score Z score 68.0 ? ? –1.6 82.0 ? ? 1.8 69.0 ? ? –0.5 85.0 ? ? 1.7 72.0 ?
Wednesday, November 26, 2014 at 7:30am

statistics
express the CI (0.045, 0.133) in the form of p ̂-E<p<p ̂+E
Tuesday, November 25, 2014 at 10:11pm

Statistics
The grades in the final exam of a random sample of 25 students produce a standard deviation, s = 9.5. a) Construct a 90% confidence interval estimate for the population variance, . b) Can we infer at 10% level of significance that the population variance is significantly ...
Tuesday, November 25, 2014 at 4:18pm

statistics
Test whether women have, on average, more pairs of shoes than men. Include all forms of sneakers, shoes, sandals, and boots. Use staffs at UTeM as the sample.
Tuesday, November 25, 2014 at 11:42am

statistics
Buy three small packages of M&Ms and 5 small packages of another brand of candy (same net weight as the M&Ms). Test whether or not the mean number of candy pieces per package is the same for the two brands.
Tuesday, November 25, 2014 at 11:41am

statistics
Suppose that young adults own an average of 3 pairs of jeans. Survey 8 people from your class to determine if the average is higher than 3.
Tuesday, November 25, 2014 at 11:41am

statistics
In a recent survey, it was stated that Malaysians watch videos on YouTube on average two hours per day. Assume that σ = 2. Using students in UTeM as the sample, conduct a hypothesis test to determine if the average for students at UTeM is lower
Tuesday, November 25, 2014 at 11:39am

MAT201-Basic Statistics
A dealership sold 15 cars last month. The purchase price of the cars, rounded to the nearest thousand, is represented in the table Purchase Price/# of cars sold $15,000 3 $20,000 4 $23,000 5 $25,000 2 $45,000 1 A.Find the mean and median B. Which measures best represents the ...
Monday, November 24, 2014 at 11:42pm

MAT201 Basic Statistics
A dealership sold 15 cars last month. The purchase price of the cars, rounded to the nearest thousand, is represented in the table Purchase Price/# of cars sold $15,000
Monday, November 24, 2014 at 11:39pm

statistics
In a correlation study, we seek to determine; *if the IV cause an outcome in the DV. *Which variable is the cause and which variable is the effect. *The direction of causation. *How well one variable predicts another variable.
Monday, November 24, 2014 at 10:16pm

statistics
from the following list of numbers of discharges each day in september, compute the mean, mode, and range.
Monday, November 24, 2014 at 11:57am

statistics
your medical terminology instructor listed the following grades for the class out of a 75-point: 33,34,43,45,45,54,59,60,62,64,66,67,68, 67,68,68,69,70,70
Monday, November 24, 2014 at 12:25am

Statistics
A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which you would ...
Sunday, November 23, 2014 at 7:12pm

statistics
You have a face-to-face statistics class in the traditional classroom setting. There are 25 males and 45 females enrolled. You’re the instructor so you like to arrive in the classroom before the first students arrive. What is the probability that the first student who ...
Sunday, November 23, 2014 at 6:35pm

statistics
An introductory psychology class has 9 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females. If one student is randomly selected from this class, what is the probability of selecting a female? Round to the nearest hundredths place if a fraction
Sunday, November 23, 2014 at 6:20pm

Statistics
If a committee of 4 students is selected from a class of 16 students, how many ways can this be done?
Sunday, November 23, 2014 at 3:59pm

statistics
In a study for a local clinic, you have found that the average number of patients between 9am and 12noon on Friday is five patients. Using a Poisson distribution and the probability more than eight patients will arrive?
Sunday, November 23, 2014 at 5:05am

statistics
Farmer Max, sells grain to Germany, owns 60 acres of wheat fields. Based on the past experience, he knows that the yield from each individual acre is normally distributed with mean 120 bushels and standard deviation 12 bushels. Help Farmer Max plan for his next year crop by ...
Sunday, November 23, 2014 at 5:02am

Statistics
The Graduate Record Exam has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. A. What percentage of the persons who take the test score above 1300? b. What percentage ...
Sunday, November 23, 2014 at 1:40am

statistics
Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. A survey examines the preferences for laundry detergent. ***The admissions office wants to estimate the cost of textbooks for students at ...
Saturday, November 22, 2014 at 9:23pm

statistics
Hello i am doing assignment in my math 20-2 class. The question is: data collected of cars passing on the road revealed that the average speed was 90 km/h with a standard deviation of 5 km/h and the data which is normally distributed a policeman is assigned to set photo radar ...
Saturday, November 22, 2014 at 2:27pm

Statistics
4. The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: (a) draw a rough sketch, darkening in the ...
Saturday, November 22, 2014 at 10:23am

statistics
A multiple-choice test consists of 29 questions with possible answers of a, b, c, d. Estimate the probability that with random guessing, the number of correct answers is at least 14. z-value (Use continuity correction)= Probability=
Saturday, November 22, 2014 at 5:56am

statistics
An airline company is considering a new policy of booking as many as 182 persons on an airplane that can seat only 160 (Past studies have revealed that only 80% of the booked passengers actually arrive for the flight.) Estimate the probability that if the company books 182 ...
Saturday, November 22, 2014 at 5:54am

statistics
What is the relationship between Sample Size and the width of the Confidence Interval? Please explain further as to why. I understand the relationship, but I can't figure out the why
Saturday, November 22, 2014 at 2:54am

statistics
Discuss the effect that the confidence level has upon the confidence interval.
Thursday, November 20, 2014 at 10:24pm

Business statistics
Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...
Thursday, November 20, 2014 at 5:19pm

Math
You are the coding Supervisor of a medium sized community hospital. You are staffed with 2 inpatient coders. Your current productivity level for your coders is 3 charts per hour. Your hospital discharges has increased to an average of 75 charts per day. How many staff members ...
Thursday, November 20, 2014 at 3:25pm

Psychology Statistics
Many animals, including humans, tend to avoid direct eye contact and even patterns that look like eyes. Some insects, including moths, have evolved eye-spot patterns on their wings to help ward off predators. Scaife (1976) reports a study examining how eye-spot patterns affect...
Thursday, November 20, 2014 at 12:43pm

Please help me with statistics
I was asked to: Calculate the d value or effect size for A but use this data instead. A. Group one 12 and group two 11 standard deviation 3 Can anyone please help me figure out how to find the d value. Any help would be great.
Thursday, November 20, 2014 at 12:49am

statistics
The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. Which portion of the bell curve relates to the answer? What is the % scored? what % of ...
Tuesday, November 18, 2014 at 4:19pm

statistics
suppose that 70% of all college students love math. in a random sample of 8 college students, let x be the number of students who love math.find p(x=6)
Tuesday, November 18, 2014 at 1:19pm

statistics
b. A mobile company XYZ wants to conduct a survey to find the proportion P of those customers that are happy with the purchase of their new mobile phone. The company took a random sample of 1000 customers who recently purchased the new mobile phone. They found that among those...
Tuesday, November 18, 2014 at 12:40am

statistics
you currently lease scanning equipment at a cost of 1,500 per quarter and two copy machines at $120 each per month. What will you need to budget annually for this leased equipment?
Sunday, November 16, 2014 at 11:29pm

statistics
The forms used in your coding area cost $100.00 per 1,000 forms for the first 2,000 and $50 for every 1,000 thereafter. If you need to order 5,000 forms, what is the total cost?
Sunday, November 16, 2014 at 11:18pm

statistics
The 95 percent confidence interval about a mean difference was -3.0 minutes to 6.5 minutes. The null hypothesis that the two population means are equal
Sunday, November 16, 2014 at 10:17pm

statistics
The same supervisor in the scenario above agreed to increase the salary of the employee to $15.00 per hour once she passed her RHIT exam. three months after beginning her employment, the employee passed her RHIT exam, What will the new budget be for salary and fringe benefits?
Sunday, November 16, 2014 at 9:53pm

statistics
The HIM coding supervisor agrees to pay a new graduate $13.50 per hour. This is a full-time coding position at 2,080 hours per year. The cost for a full-time employee's fringe benefits is 24 percent of the employees salary. How much must the supervisor budget for the ...
Sunday, November 16, 2014 at 9:42pm

Statistics
It takes approximately 15 minutes to code one record, How many personnel hours would be needed to code 1,424 discharges for the month?
Sunday, November 16, 2014 at 9:11pm

statistics
An employee currently earning $13.85 per hour has been awarded a 3.5 percent merit raise. what will the employee's hourly salary be with this increase?
Sunday, November 16, 2014 at 9:06pm

statistics
After one month of operation, the health information services at Community Health Center determined that there were two records misfiled out of the 450 active records. What is the filing accuracy rate for this area?
Sunday, November 16, 2014 at 8:57pm

statistics
Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...
Sunday, November 16, 2014 at 8:55pm

Statistics
Community Health Center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its HIM department get started. Calculate the number of new shelving units needed for a medical record filing system based on eight shelves per ...
Sunday, November 16, 2014 at 8:51pm

statistics
if your HIM department has 100,000 active records and you received 5,352 requests for records within a six-month period, what is the request rate for the past six months?
Sunday, November 16, 2014 at 8:38pm

statistics
How many ways can the sequence ANNV be arranged
Sunday, November 16, 2014 at 4:27pm

statistics
A Coach found the correlation between physical fitness and athletic ability to be r=.65. the mean and standard deviation of the physical fitness test was 330, 50. the mean and standard deviation of the athletic ability test was 9, 2. If you have a physical fitness score of 350...
Sunday, November 16, 2014 at 1:46pm

statistics
It seems that people are choosing or finding it necessary to work later in life. Random samples of 200 men and 200 women age 65 or older were selected, and 80 men and 59 women were found to be working. At á = 0.01, can it be concluded that the proportions are different
Saturday, November 15, 2014 at 9:01pm

statistics
Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1 + X) · E(1/1 + X)= 1. n→∞
Saturday, November 15, 2014 at 1:19pm

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