Statistics

One hundred students took a statistics exam where the mean score was 78. The distribution was normal. The standard deviation was 4. If Chris earned an 80 on the exam, at approximately what percentile did his grade fall? (Round your answer to the nearest whole number.)
Mean=78
SD=4
x=80
80-78/4=0.5

  1. 👍 0
  2. 👎 0
  3. 👁 175
  1. Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability in larger portion of Z = .5. Multiply by 100.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. basic statistics for the behavioral sciences

    (a)on a normal distribution of exam scored, poindexter scored at the 10th percentile, so he claims that he outperformed 90% of his class. Why is he correct or incorrect? Because Foofy's score is in a tail of the distribution, she

  2. statistics

    On an exam whose scores followed a normal distribution, a student's z-score was +2. What percentage of students scored better than he did? (Use the 68-95-99.7 Rule.)

  3. Statistics

    In Professor Smith's statistics course, the correlation between students' total scores before the final exam and their final exam scores is r = 0.67. The pre-exam totals for all students in the course have a mean of 275 and a

  4. Math (Algebra 1)

    Juan’s first 3 exam scores are 85, 93, and 87. What does he need to score on his next exam to average 90 for all 4 exams? let x represent the score on his next exam (put this in a multi-step equation) PLEASE HELP

  1. Math

    Twelve students sit for an exam which has a maximum score of 100. The average of twelve scores achieved by the students in the exam was 95. What is the minimum mark a student could have scored?

  2. statistics

    2. Why is it important to know the mean and standard deviation for a data set when applying the empirical rule? 3. If we are focused on 68% of the normal distribution, what percentage of the distribution is left in the upper tail

  3. Statistics

    5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What

  4. Statistics: IQ Score (X) and Exam Score (Y)

    Assuming that the regression equation for the relationship between IQ score and psychology exam score is Y' = 9+ 0.274X, what would you expect the psychology exam scores to be for the following individuals given their IQ exam

  1. statistics

    1. Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and a standard deviation of 4. Do not use the web calculator to answer the following questions.

  2. statistics

    SAT Exam Scores – A school administrator wonders if students whose first language is not English score differently on the math portion of the SAT exam than students whose first language is English. The mean SAT math score of

  3. Statistics

    Scores on the SAT form a normal distribution with u=500 and o=100. a. You are trying to qualify for a scholarship and find out that you need to have a higher score than at least 75% of the students. What score will you need? b.

  4. statistics

    the five number summary of the distribution of scores on a statistics exam is 0 26 31 36 50 316 students took the exam. the histogram of all 316 scores was approximately normal. Thus the variance of test scores must be about I

You can view more similar questions or ask a new question.