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Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on...

Exhibit 7-2
A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores.
Paper Number Grade Status
1 65 Pass
2 87 Pass
3 92 Pass
4 35 Fail
5 79 Pass
6 100 Pass
7 48 Fail
8 74 Pass
9 79 Pass
10 91 Pass
7 Refer to Exhibit 7-2.  The point estimate for the mean of the population is
a. 750
b. 100
c. 85
d. 75
8 Refer to Exhibit 7-2.  The point estimate for the standard deviation of the population is
a. 419.56
b. 20.48
c. 19.43
d. 377.6
9 Refer to Exhibit 7-2.  The point estimate for the variance of the population is
a. 419.56
b. 20.48
c. 19.43
d. 377.6
10 Refer to Exhibit 7-2.  The point estimate for the proportion of all students who passed the course is
a. 0.8
b. 0.2
c. 1.8
d. 1.2
Math   Statistics-And-Probability   
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Answer #1

7)

The point estimate for the mean =75

8)

The point estimate for the standard deviation=20.48

9) point estimate for the variance of the population=419.56

10)  point estimate for the proportion of all students who passed the course =8/10 =0.8

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