Find the probability x takes on a value smaller than the, Basic Statistics

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Find the probability x takes on a value smaller than the

The probability distribution for a random variable X is given in the table below.

x	5	10	15	20
P(x)	0.10	0.15	0.70	0.05

a. Find the mean, variance, and standard deviation of X.

b. Find the probability X takes on a value smaller than the mean.

c. Using the probability distribution, explain why the value of the mean of X makes sense.

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