Question

1/. Numbered disks are placed in a box and one disk is selected at random . If there are 8 red disks numbered 1 through 8 and 5 yellow disks numbered 9 through 13, find the probability of selecting a disk numbered 3, given that a red disk is selected. Express your answer as simplified fraction.

A: 5/13. B: 1/8. C: 8/13. D: 1/13

2/ 1)Sixty-five percent of men consider themselves knowledgeablefootball fans. If 11 men are randomly selected, find theprobability that exactly seven of them will consider themselvesknowledgeable fans. Round the nearest thousandth

A: 0.038. B: 0.636. C : 0.243. D: 0.65

3/ Suppose a brewery has a filling machine that fills 12-ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.34 ounces and a standard deviation of 0 .04 ounces. Find the probability that the bottle contains fewer than 12.24 ounces of beer.

a) 0.9938

b) 0.5062

c) 0.0062

d) 0.4938

4/ Assume that blood pressure readings are normally distributed with a mean of 124 and a standard deviation of 9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 126. Round to four decimal places

A: 0.9938. B: 0.9998. C: 0.0062. D: 0.8615

Answer 1