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Florida State University has 14statistics classes scheduled for its Summer 2013term. One class has space available for 30students, eight classes have space for 60students, one class has space for 70students, and four classes have space for 100students.

a. What is the average class size assuming each class is filled to capacity?

b. Space is available for 980students. Suppose that each class is filled to capacity and select a statistics student at random. Let the random variable Xequal the size of the student’s class. Define the PDF for X.

c. Find the mean of X.

d. Find the standard deviation ofX.

Short Answer

Expert verified

a) The number of scholars are 70

b) The table containing variables Xand P(x)

c) The typical class size and also the mean is 70.

d) Variance is 20.702

Step by step solution

01

Given information (part a)

The number of classes which has a space for 30students=1

The number of classes which has a space for 60students=8

The number of classes which has a space for 70students=1

The number of classes which has a space for 100students=4

02

Explanation (part a)

The numberof scholars:

=30+8×60+70+4×10014=70

03

Given information (part b) 

The number of classes which has a space for 30students=1

The number of classes which has a space for 60students=8

The number of classes which has a space for 70students=1

The number of classes which has a space for 100students=4

04

Explanation (part b)

The category length is about by variable X. Tables containing variables and likelihood are offered as

X
P(X)
30
114
60
814
90
114
100
414
05

Given information (part c)

The number of classes which has a space for 30students=1

The number of classes which has a space for 60students=8

The number of classes which has a space for 70students=1

The number of classes which has a space for 100students=4

06

Explanation (part c)

Variable X has such a method value

μ=30114+60814+70114+100414=70

07

Given information (part d)

The number of classes which has a space for 30students=1

The number of classes which has a space for 60students=8

The number of classes which has a space for 70students=1

The number of classes which has a space for 100students=4

08

Explanation (part d)

Constant X's Variance was

σ=x(xμ)2P(x)=20.702

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