a)
P(X>=3)
= 1 - P(X<=2)
X | P(X) | |||||
P ( X = 0) = C (7,0) * 0.3^0 * ( 1 - 0.3)^7= | 0 | 0.0824 | ||||
P ( X = 1) = C (7,1) * 0.3^1 * ( 1 - 0.3)^6= | 1 | 0.2471 | ||||
P ( X = 2) = C (7,2) * 0.3^2 * ( 1 - 0.3)^5= | 2 | 0.3177 |
= 0.3529
b)
For 7 students
X | P(X) | |
P ( X = 0) = C (7,0) * 0.3^0 * ( 1 - 0.3)^7= | 0 | 0.0824 |
= 1 - P(X=0)
= 0.9176
Please let me know in case of any doubt.
Thanks in advance!
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