Suppose that the probability distribution of a random variable x can be described by the formula p(x)= x/15 for each of the values x=1,2,3,4,5. For example, p(x=2)=2/15
a. Write out the probability distribution of x in tabular form. Keep p(x) in Fraction
b. Show that the probability distribution of x
satisfies the properties of a discrete probability distribution.
c. Calculate the mean and standard deviation of x
d. Compute the interval (u-2(sigma),u+sigma)
e. Find the actual probability that x falls within the interval of part d

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are you need a documented answer ?

Yes, I think so

I believe I solved a and b, but and stuck on c right now

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