## 2013/02/22

### Ryh46

1. If Z is a ideal normal variable, square off the prospect.

The probability that Z lies between 0 and 3.01
A) 0.1217
B) 0.4987
C) 0.9987
D) 0.5013
2. If Z is a model normal variable, queue up the probability.

The probability that Z is less than 1.13
A) 0.8907
B) 0.8708
C) 0.1292
D) 0.8485
3. If Z is a exemplification normal variable, find the probability.

The probability that Z is greater than -1.82
A) 0.9656
B) 0.0344
C) 0.4656
D) -0.0344
4. Assume that X has a normal distribution, and find the indicated probability.

The pissed is ? = 22.0 and the standard deviation is ? = 2.4.
Find the probability that X is between 19.7 and 25.3.
A) 1.0847
B) 0.7477
C) 0.4107
D) 0.3370
5. Assume that X has a normal distribution, and find the indicated probability.

The mean is ? = 15.2 and the standard deviation is ? = 0.9.
Find the probability that X is greater than 17.
A) 0.9821
B) 0.9713
C) 0.0228
D) 0.9772
6. Find the indicated probability.

The diams of bolts produced by a certain gondola are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?
A) 47.72%
B) 2.28%
C) 37.45%
D) 97.72%
7. Find the indicated probability. The weekly salaries of teachers in one distinguish are normally distributed with a mean of \$490 and a standard deviation of \$45. What is the probability that a randomly selected teacher earns more than \$525 a week?
A) 0.2823
B) 0.7823
C) 0.2177
D) 0.1003
8. Solve the problem.

The scores on a certain test are normally distributed with a mean score of 48 and a standard deviation of 3. What is the probability that a sample of 90 students will have a mean score of at least 48.3162?
A) 0.3174
B) 0.3413
C) 0.1587
D) 0.8413
9. Use the doggedness correction and describe the region of the normal curve that corresponds to the indicated binomial probability.

The probability of more than 33 correct answers
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