The percentage of people (to the nearest 10) responding to an advertisement is a random variable with

Question:

The percentage of people (to the nearest 10) responding to an advertisement is a random variable with the following probability distribution:
x(%) ...P(x)

0 ......0.10

10 ......0.20

20 ......0.35

30 ......0.20

40 ......0.10

50 ......0.05

a. Show that P(x) is a probability distribution.
b. Find the cumulative distribution function.

c. Find the probability that more than 20% will respond to the ad.

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...