Author Question: If x is a binomial random variable, calculate 2 for n = 40 and p = 0.3 . A) 3.6 B) 12 C) 8.4 D) ... (Read 99 times)

bobthebuilder · **on:** Jun 24, 2018

If x is a binomial random variable, calculate 2 for n = 40 and p = 0.3 .

A) 3.6 B) 12 C) 8.4 D) 2.898

Question 2

A local newspaper claims that 70 of the items advertised in its classifieds section are
sold within 1 week of the first appearance of the ad.

To check the validity of the claim,
the newspaper randomly selected n = 25 advertisements from last year's classifieds and
contacted the people who placed the ads. They found that 16 of the 25 items sold within
a week. Based on the newspaper's claim, is it likely to observe x 16 who sold their item
within a week? Use a binomial probability table.

daiying98 · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

C

Answer to Question 2

Let x = the number of the 25 ads that resulted in the item being sold within a week.
Then X is a binomial random variable with n = 25 and p = 0.70.
P(x