2. Use the graph of the given normal distribution to identify μ and σ.62 86 68 74 80 92 98 X
Section 7.1

3. Find the probability of the standard normal random variable Z.
P(Z < 1.49)
0.9319
0.0681
0.6879
0.3121
Section 7.2

4. Find the probability of the standard normal random variable Z.
P(Z ≥ –2.31)
0.0104
0.0087
0.9896
0.9913
Section 7.2

5. Find the probability of the standard normal random variable Z.
P(–2.14 < Z < 0.95)
0.1170
0.0681
0.1873
0.8127
Section 7.2

6. Find the Z-score such that the area under the standard normal curve to the right is 0.10.
1.28
-1.28
0.5398
0.8159
Section 7.2

7. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability a randomly selected person has an IQ score greater than 120.
0.9082
0.6293
0.0918
0.3707
Section 7.2

8. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Determine the 90th percentile for IQ scores.
1.28 81
119
114
Section 7.2