Find the z-score for the value 83, when the mean is 52 and the ...

[maychende]

Find the z-score for the value 83, when the mean is 52 and the standard deviation is 6.
 
  A) z = 1.48 B) z = 5.00 C) z = 5.17 D) z = -1.48

Question 2

Three fair coins are tossed and either heads or tails is observed for each coin. Events A and B are defined as follows.
 
  A: Three heads are observed.
  B: Exactly two heads are observed.
 
  Is P(A  B) equal to the sum of P(A ) and P(B)? Explain.

[ASDFGJLO]

Answer to Question 1

C

Answer to Question 2

Yes, P(A  B) is equal to the sum of P(A ) and P(B) because events A and B are mutually exclusive.