5. Given a standard normal curve, what is the approximate value ofP(1.26 <z< 2.43)?

A. 0.3962

B. 0.0963

C. 0.8787

D. 0.4929

6. The results for a job satisfaction in percent of employees of a certain company are normally distributed. The mean job satisfaction is 85 with a standard deviation of 8. What is the minimum job satisfaction level to belong in the top 10%?

A. 90.12

B. 93.25

C. 95.24

D. 89.35

18. Apples chosen at random have a mean mass of 225 grams and standard deviation of 25 grams. Assuming that the distribution is normal, what is the probability of choosing an orange with a mass between 175 grams 230 grams?

A. 0.4565

B. 0.5565

C. 0.6525

D. 0.6575

21. In a shipment of mangoes, the mangoes have weights that are normally distributed with a mean of 300 grams and a standard deviation of 25 grams. If the lightest 10% of the mangoes are excluded, determine the weight of the lightest mango that is kept.

A. 306.25

B. 326.25

C. 295.30

D. 285.15