Question

A coin tossed 200 times mean and standard deviation

Answer 1

Answer:

mean 100

standard deviation 7.07 (approx)

Step-by-step explanation:

But what's the random variable?  Are we counting heads maybe?  That's a common exercise, so let's suppose that's what you meant....

If X is the number of heads when a coin is tossed 200 times, then X has a binomial distribution with n = 200 and p = the probability of getting a head.

Let's suppose the coin is meant to be a "fair" coin, so p = 0.5.

Then

mean X = n p = 200 × 0.5 = 100

sd X = √( np(1-p) ) = √( 200 × 0.5 × 0.5 ) = √50 ≈ 7.07