Suppose that x has a distribution with= 12 and= 4. If a random sample is taken of size n = 36, findstd dev. xbar.

12.00

0.67

2.00

0.11

4.00

The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that an 18-year-old man selected at random is greater than 72 inches tall?

12.00

0.67

2.00

0.11

4.00

The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that the average heightof a sample of twenty 18-year-old men will be less than 67 inches? Round your answer to four decimal places.

0.9032

0.4032

0.8064

0.0681

0.1936

A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about 5% defective toys. The toys are manufactured in lots of n = 100. Let r be a random variable representing the number of defective toys in a lot. Thenis the proportion of defective toys in a lot. Check thatcan be approximated by a normal random variable. What is?

5

5

10

0.05

1

A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about 6% defective toys. The toys are manufactured in lots of n = 100. Let r be a random variable representing the number of defective toys in a lot. Thenis the proportion of defective toys in a lot. Check thatcan be approximated by a normal random variable. What is? Round your answer to three decimal places

0.002

0.006

0.100

1.000

0.024

A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about 6% defective toys. The toys are manufactured in lots of n = 100. Let r be a random variable representing the number of defective toys in a lot. Thenis the proportion of defective toys in a lot. In this caseand. Calculate. Round your answer to four decimal places.

0.3930

0.8930

0.107

0.0874

0.3207