Identify the score corresponding to the indicated percentile. IQ scores are known to be normally distributed with a mean of 100 and a standard * deviation of 15. What IQ score does 33% of the population fall at or below?

10 assume that the number of production defects is 26 and that 12 of these are classified as major defects, 7 are classified as design defects, and 11 were neither major defects nor design defects. How many of the design defects were major?

If n(B) = 24, n(A ∩ B) =5, and n(A ∪ B) = 42, find n(A). 24 23 25 21

3. Is 2 ∈ { 2 } ? Why?