Raquel B.

asked • 03/09/22

I don’t understand how to do this question.

At a particular University, students’ grades in introductory statistic classes are generally unimodal and skewed to the left with a mean of 63 and a standard deviation of 18. (Round to 2 decimal places for z-values and 4 decimal places for the rest)

a) what is the distribution of grades?

b) if n=40 students selected at random then the distribution of the sample mean grade is ____ with mean of ____ and standard deviation of _____.

c) The probability that the sample mean grade of these 40 students is less than 67 is ___.

d) if n= 40 students selected at random then the distribution of the sample total grade is ___ with mean ____ and standard deviation ______.

e) The probability that the total grade for these 40 students is less than 2680.0

McKayla G.

* unimodal: one curve (usually the curve is symmetrical but not always) * skewed to the left: downward slope is on the left, so it rises going to the right
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03/29/22

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