a)P(exactly 5 ) =9C5(0.49)5(0.51)4 =0.2408
P(at most 5) =P(X<=5) =0.7654
P(at least 5) =P(X>=5)=0.4754
b)
P(at least one adult)=P(X>=1)=0.9977
P(at most 1 adult) =P(X<=1)=0.0225
c)
P(between 5 and 7) =0.4585
d)
x | P(x) | x | P(x) | |
0 | 0.0023 | 5 | 0.2408 | |
1 | 0.0202 | 6 | 0.1542 | |
2 | 0.0776 | 7 | 0.0635 | |
3 | 0.1739 | 8 | 0.0153 | |
4 | 0.2506 | 9 | 0.0016 |
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