A coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed.
A) 36
B) 18
C) 4.24
D) 6.78

Question

Quizplus · Accepted Answer

The standard deviation for the number of heads can be calculated using the formula:
σ = √(np(1-p))
where n is the number of trials (tosses in this case), p is the probability of getting a head (which is 0.5 for a fair coin).
So, σ = √(72 x 0.5 x 0.5) = 4.24
Therefore, the answer is C.

A Coin Is Tossed 72 Times