Question

It is estimated that 40% of clowns like scaring children. A sample of 15 clowns are...

It is estimated that 40% of clowns like scaring children. A sample of 15 clowns are indicted. Assuming the binomial requirements are met, what is the probability that exactly 7 of these clowns like scaring children?

A. 0.610

B. 0.213

C. 0.177

D. 0.787

E. 0.390

Math   Statistics-And-Probability   
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Answer #1

The answer is C. 0.177.

The output is:

15 n
0.4 p
cumulative
X P(X) probability
0 0.00047 0.00047
1 0.00470 0.00517
2 0.02194 0.02711
3 0.06339 0.09050
4 0.12678 0.21728
5 0.18594 0.40322
6 0.20660 0.60981
7 0.17708 0.78690
8 0.11806 0.90495
9 0.06121 0.96617
10 0.02449 0.99065
11 0.00742 0.99807
12 0.00165 0.99972
13 0.00025 0.99997
14 0.00002 1.00000
15 0.00000 1.00000
1.00000
0 0
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