The random variable x representing the number of cherries

The random variable X, representing the number of cherries in a cherry puff, has the following probability distribution:

x	4	5	6	7
P(X=x)	0.2	0.4	0.3	0.1

(a) Find the mean and variance of X.

(b) Find the probability that the number of cherries in a cherry puff will be no more than 5

(d) Find the probability that the average number of cherries in 36 cherry puffs will be greater than 5.5

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The random variable x representing the number of cherries : the random variable x representing the number of cherries in a cherry puff has the following probability

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