Question

Problem 1) The area under a probability density function is equal to a) 100 b) 10 d) 0 Problem 2) What are the mean and sample standard deviation of the following numbers? X- (71.3, 74, 74.25, 78.54, 80.6) a) 74.3, 2.7 b) 74.3, 3.8 c) 75.7, 2.7 d) 75.7, 3.8 Problem 3) How many combinations, without repetition, can be made using the letters a, e, i, o and u taken 2 at a time a) 10 b) 20 c) 15 d) 32 Problem 4) A bag contains 100 balls numbered 1 to 100. One ball is drawn from the bag. What is the probability that the number on the ball selected will be odd or less than 80? a) 0.9 b) 0.59 c) 0.6 d) 0.89 Problem 5) For the probability function f(x)-cos(x) for 0 s x s Tt/2 what is the probability of the random variable x being less than 1? a)0.84 b) 0.02 c)0.42 d) 0.16

Answer 1