The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times.

a. i. Write down the mean number of heads (240)
ii. Find the standard deviation of the number of heads (12)
b. Find the probability that the number of heads obtained is less than one standard deviation away from the mean.

Part b is what I need help with. I have identified that the range of successes is between 228 and 252, and I know that I'm supposed to use the binomial distribution function, but we didn't learn in class what that is or how to use it.

1 answer

google is your friend.