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We toss a pair of coins and say that we have a success if both are...

We toss a pair of coins and say that we have a success if both are heads, and failure otherwise. Let X be the number of successes if we toss n pairs of coins.
a) What is the mean and the standard deviation of X if n = 48?
b) Estimate the probability that X > 15 using the normal approximation. Do not use the continuity correction.

c)Estimate the probability that X = 12 using the normal approximation with the continuity correction.

Math   Statistics-And-Probability   
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