DSCI FINAL EXAM 2025 QUESTIONS AND ANSWERS
Compared to the area between z = 0.50 and z = 0.75, the area between z = 1.50 and z = 1.75 in the
standard normal distribution will be: - CORRECT ANSWER✅✅✅Smaller
For a continuous uniform distribution U(200, 400), the parameters are μ = 300 and σ = 100. - CORRECT
ANSWER✅✅✅False
A continuous uniform distribution U(100, 200) will have the same standard deviation as a continuous
uniform distribution U(200,300). - CORRECT ANSWER✅✅✅True
Any normal distribution has a mean of 0 and a standard deviation of 1. - CORRECT
ANSWER✅✅✅False
The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean of
14 inches and a standard deviation of 3 inches. What lower limit should the State Game Commission set
on length if it is desired that 80 percent of the catch may be kept by fishers? - CORRECT
ANSWER✅✅✅11.48
A machine dispenses water into a glass. Assuming that the amount of water dispensed follows a
continuous uniform distribution from 10 ounces to 16 ounces, the average amount of water dispensed
by the machine is: - CORRECT ANSWER✅✅✅13 ounces
In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of
25 minutes and a standard deviation of 4 minutes. For a simple haircut, the middle 90 percent of the
customers will require: - CORRECT ANSWER✅✅✅Between 18.4 and 31.6 minutes
Light bulbs are normally distributed with an average lifetime of 1000 hours and a standard deviation of
250 hours. The probability that a light bulb picked at random will last less than 1500 hours is about: -
CORRECT ANSWER✅✅✅97.72 percent
The area under the normal curve between z = 0 and z = 1 is __________________________________
the area under the normal curve between z = 1 and z = 2. - CORRECT ANSWER✅✅✅Greater than
Compared to the area between z = 0.50 and z = 0.75, the area between z = 1.50 and z = 1.75 in the
standard normal distribution will be: - CORRECT ANSWER✅✅✅Smaller
For a continuous uniform distribution U(200, 400), the parameters are μ = 300 and σ = 100. - CORRECT
ANSWER✅✅✅False
A continuous uniform distribution U(100, 200) will have the same standard deviation as a continuous
uniform distribution U(200,300). - CORRECT ANSWER✅✅✅True
Any normal distribution has a mean of 0 and a standard deviation of 1. - CORRECT
ANSWER✅✅✅False
The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean of
14 inches and a standard deviation of 3 inches. What lower limit should the State Game Commission set
on length if it is desired that 80 percent of the catch may be kept by fishers? - CORRECT
ANSWER✅✅✅11.48
A machine dispenses water into a glass. Assuming that the amount of water dispensed follows a
continuous uniform distribution from 10 ounces to 16 ounces, the average amount of water dispensed
by the machine is: - CORRECT ANSWER✅✅✅13 ounces
In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of
25 minutes and a standard deviation of 4 minutes. For a simple haircut, the middle 90 percent of the
customers will require: - CORRECT ANSWER✅✅✅Between 18.4 and 31.6 minutes
Light bulbs are normally distributed with an average lifetime of 1000 hours and a standard deviation of
250 hours. The probability that a light bulb picked at random will last less than 1500 hours is about: -
CORRECT ANSWER✅✅✅97.72 percent
The area under the normal curve between z = 0 and z = 1 is __________________________________
the area under the normal curve between z = 1 and z = 2. - CORRECT ANSWER✅✅✅Greater than
