probability and statistics.
posted by penny lane .
I am preparing for a chapter test in my prob/stat class and since my teacher no longer cares about our class and the textbook is as confusing as a foriegn languaga, i am in need of help. i am trying to review an old quiz ao here is one of the questions.
the probability that a costomer selects 1,2,3,4 or 5 items at a convenience store are 3.02,.012,.023,.018 and.015, respectively.
find P(X>3.5)
find P(X<5)

probability and statistics. 
TutorCat
I think there's a mistake with the probabilities were given. 1) probabilities can't be >1 (you get greater than 100% chance). 2) the probabilities don't add up to 1
here is what I think they should be:
.32, .12, .23, .18, .15
P(x>3.5) = probability that a customer selects more than 3.5 items = p(4) + p(5) = .18 + .15
you can do the other one by yourself. 
probability and statistics. 
Anonymous
23
Respond to this Question
Similar Questions

algebra
how do I help my son answer this question/ cary spent 1/3 of his class working on fraction problems and 3/6 of his class working on algebra problems. He spent the last 10 minutes of his class reading a chapter in his textbook. How … 
MDM4UO
A teacher provides pizza for his class if they earn an a average on any test the proability of the class getting an A average on one of his test is 8% What is the probability that the class will not earn a pizza for the firt seven … 
Chemistry
Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment … 
statistics
for mu homework, we are making histograms. on the assignment, we need to list the class limits, class boundaries, midpoint, frequency and relative frequency for each class. i know how to find all of those except for the midpoint since … 
statistics
this is a problem in my statistics class, and I am lost to me, it is confusing or missing something here is the problem please help grade points are assignede as follows: a=4,b=3,c=2,d=1,f=0. grades are weighted according to credit … 
Check answers please Statistics
Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student … 
English
Five sentence paragraph. Preparing for a test should start the first day in class this includes paying attention in class,taking good notes,review all assignments on a regular basis. Budget your time make sure you set aside time to … 
stat
A contract employs three types Class A , Class B and class c. to class A workers, he pays an average monthly salary of $ 400, to class B workers, he pays an average monthly salary of $ 320 and to class C workers he pays an average … 
English
Homework Help: English Posted by rfvv on Monday, March 7, 2016 at 2:25am. 1. The first class was with my homeroom teacher, Mr. Jang. 2.The first class was my homeroom teacher, Mr. Jang's class. 3. The first class was my homeroom teacher, … 
Math ?
I have a dilemma; my English professor doesn’t give us our grades so I currently don’t know what percent I am at in the class. I really need to know since I need to know if I’ll be passing or not. He doesn’t grade anything …