Some iq tests are standardized to a normal model n(100,18). a) what cutoff value bounds the highest 5% of all iqs? b) what cutoff value bounds the lowest 40% of the iqs? c) what cutoff values bound the middle 70% of the iqs?

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7