The probability of rolling a 2 is 1/6. If X is a random variable representing the number of 2s that are obtained after rolling a die 23 times, then X follows a binomial distribution with success probability p = 1/6 across n = 23 trials.
The variance of a binomial distribution with parameters p and n is n p (1 - p), so the standard deviation in this case would be
√(23 • 1/6 • 5/6) ≈ 1.8
Answer:
7.17897988E23
Step-by-step explanation:
Answer:
t = -18, 18
Step-by-step explanation:
Take the square root of both sides of the equation.
... t = ±√324 = ±18
My calculator says that probability is about 76.34%.
Just think of 8x10 it equals 80