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Chapter 4: Q. 55 (page 287)

Use the following information to answer the next five exercises: Suppose that a group of statistics students is divided into two groups: business majors and non-business majors. There are 16business majors in the group and seven non-business majors in the group. A random sample of nine students is taken. We are interested in the number of business majors in the sample.

On average (渭), how many would you expect to be business majors?

Short Answer

Expert verified

In the group of statistics students, the predicted number (average) of business majors is渭=6.26鈮�6

Step by step solution

01

Formula used

The mean of a probability distribution with parameters r,b&nis:

渭=nrr+b

02

Given

Already we are havingr=16,b=7and n=9

03

Calculation

The mean is calculated by substituting r=16,b=7and n=9into the formula above:

渭=9*1616+7=6.2609

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