Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5 of all welds done will be substandard.
If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find between 10 and 20 substandard welds? A) 0.8132 B) 0.4066 C) 0.2033 D) 0.6377
Q. 2A nationwide survey claimed that at least 65 of parents with young children condone spanking their child as a regular form of punishment.
In a random sample of 100 parents with young children, how many would need to say that they condone spanking as a form of punishment in order to refute the claim at a = 0.5? A) You would need 57 or less parents to support spanking to refute the claim.
B) You would need exactly 57 parents to support spanking to refute the claim.
C) You would need 58 or less parents to support spanking to refute the claim.
D) You would need more than 57 parents to support spanking to refute the claim.
Q. 3Suppose that M and N are two events, P(M) = 0.23, P(N) = 0.08, and P(M and N) = 0.05. What is P(MN)?
A) 0.625 B) 0.217 C) 0.030 D) 0.260
Q. 4In a lottery, a player selects six numbers between 1 and 37 inclusive. The six winning numbers (all different) are selected at random from the numbers 1-37. To win a prize, the player must match three or more of the winning numbers.
What is the probability that the player matches exactly 3 numbers? A) 0.0387 B) 0.0322 C) 0.0451 D) 0.0483
Q. 5Suppose that S and T are two events, P(S) = 0.67 and P(T S) = 0.13. What is P(S and T)?
A) 0.0871 B) 0.8 C) 0.7129 D) 0.5829
Q. 6If P(B) = 0.3, P(A or B) = 0.6, and P(A and B) = 0.1, find P(A ).
A) 0.4 B) 0.3 C) 0.1 D) 0.9
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