BUAL 2650 exam 1 QUESTIONS & ANSWERS | VERIFIED SOLUTIONS @2026!!!!

BUAL 2650 exam 1 QUESTIONS & ANSWERS | VERIFIED SOLUTIONS
@2026!!!!
Consider a normal population with a mean of 10 and a variance of 4. Find P(X ≥ 10).



Multiple Choice

−.50

.00

.50

1.00 - ANSWERS💫✔️-.50



________ values of the standard deviation result in a normal curve that is narrower and more peaked.



Multiple Choice

Uniform

Equal

Larger

Smaller - ANSWERS💫✔️-Smaller



What is the probability that a standard normal random variable will be between −2 and 2?



Multiple Choice

.4772

.9544

.0228

.9772 - ANSWERS💫✔️-.9544



Consider a normal population with a mean of 10 and a variance of 4. Find P(X < 6).

, Multiple Choice

.9772

.8413

.1587

.0228 - ANSWERS💫✔️-.0228



Values of the standard normal random variable are measured



Multiple Choice

in the number of standard deviations from the mean.

in the units in which the mean is measured.

in squared units in which the mean is measured.

None of these answers are correct. - ANSWERS💫✔️-in the number of standard deviations from the
mean



An aptitude test has a mean score of 80 and a standard deviation of 5. The population of scores is
normally distributed. What proportion of tests has scores over 90?



Multiple Choice

.0228

.9544

.0456

.9772 - ANSWERS💫✔️-.0228



Which of the following statements is not a property of the normal probability distribution?



Multiple Choice

95.44 percent of all possible observed values of the random variable x are within plus or minus three
standard deviations of the population mean.

The mean, median, and mode are equal.