1342 Chapter 6

For the standard normal distribution, calculate the area to the right of the z-score 1.24 and round to four decimals.

For the standard normal distribution, calculate the area between the z-scores -2.16 and -1.09 and round to four decimals.

For the standard normal distribution, calculate the area to the left of the z-score -3.99 and round to four decimals.

Suppose that the weight of sweet cherries is normally distributed with mean μ=6 ounces and standard deviation σ=1.4 ounces. What proportion of sweet cherries weigh more than 4.7 ounces?

Suppose that the weight of sweet cherries is normally distributed with mean μ=6 ounces and standard deviation σ=1.4 ounces. What is the probability of choosing a sweet cherry that weighs less than 4.7 ounces?

Assume that the national average score on a standardized test is 1010, and the standard deviation is 200, where scores are normally distributed. What is the probability, expressed as a percentage, that a test taker scores at least 1600 on the test? Round the percentage to two decimals and make sure to enter the % symbol.

Assume that the national average score on a standardized test is 1010, and the standard deviation is 200, where scores are normally distributed. What is the probability that a test taker scores between 1200 and 1600 on the test? Round to four decimals.

A certain refrigerator has a mean lifetime of 8 years with standard deviation of 1.5 year. What is the probability to four decimals that the refrigerator will last at least 10 years? Assume lifetimes of refrigerators are normally distributed.

For the standard normal distribution, calculate the z-score with 0.4237 area to the right and round to two decimals.

For the standard normal distribution, calculate the z-score that represents the 90th percentile and round to two decimals.