If the probability that an object dropped from a certain height will strike…
2024
If the probability that an object dropped from a certain height will strike the ground is 80 percent and if 12 objects are dropped from the same place, find the mean and variance.
- A.
9.6,1.92
- B.
8.6,1.92
- C.
9.6,1.82
- D.
8.6,1.82
Attempted by 1118 students.
Show answer & explanation
Correct answer: A
Given,
p= 80% = 0.8 and q = 1-p = 20% = 0.2 and n= 12
Therefore,
Mean= np = (12)(0.8) = 9.6
And,
Variance = npq = (9.6)(0.2)= 1.92