If P(A) = .75, P(A B) = .86, and P(A B) = .56, then P(B) = a. ...

[Jipu 123]

If P(A) = .75, P(A  B) = .86, and P(A  B) = .56, then P(B) =
 a. .25
  b. .67
  c. .56
  d. .11

Question 2

A local electronics firm wants to determine their average daily sales (in dollars.) A sample of the sales for 36 days revealed an average sales of 139,000 . Assume that the standard deviation of the population is known to be 12,000.
 a. Provide a 95 confidence interval estimate for the true average daily sales.
  b. Provide a 97 confidence interval estimate for the true average daily sales.

[Ptupou85]

Answer to Question 1

b

Answer to Question 2

a. 135,080 to 142,920
b. 134,660 to 143,340

[Jipu 123]

Excellent

[xiazhe]

Wow, this really help