2. A child is 40 inches tall, which places her at the 90th percentile of all children of similar age. The heights for children of this age form an approximately Normal distribution with a mean of 38 inches. Based on this information, what is the standard deviation of the heights of all children of this age? (a) 0.20 inches (b) 0.31 inches (c) 0.65 inches (d) 1.21 inches (e) 1.56 inches

Scores on a recent NYS Standardized Exam were normally distributed with a mean of 77.6 and a standard deviation of 4.3. Find the NYS Standardized Exam score that separates the bottom 2.5% from the rest. Round this score to the nearest tenth

The distribution of heights of adult American men is approximately normal with a mean of 69 inches and a standard deviation of 2.5 inches. a. What percent of these men are at least 71.5 inches tall? b. What percent of these men are between 64 and 74 inches tall?

The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1300 hours and a standard deviation of 85 hours. What percentage light bulbs last between 1160 hours and 1240 hours, to the nearest tenth? Statistics Calculator

The typical amount of sleep per night for college graduate students has a normal distribution with a mean of 5 hours. What is the standard deviation of this distribution if ​16% of students sleep more than 6.5​ hours?   A. ​-1.52   B. ​-1.55   C. 1.52   D. 1.55

Exhibit 6-5The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces.   Refer to Exhibit 6-5. What percentage of items will weigh between 6.4 and 8.9 ounces?

According to the Department of Education the mean number of hours college students spend studying each week follows a normal distribution with a mean of 20 hours and standard deviation of 9 hours. What ‘hours of study’ represents the 90th percentile?           What ‘hours of study’ represents the 15th percentile?

A successful basketball player has a height of 6 feet 11 ​inches, or 211 cm. Based on statistics from a data​ set, his height converts to the z score of 5.17. How many standard deviations is his height above the​ mean?

The weights for newborn babies is approx normally distributed with a mean of 6.1 pounds and a standard deviation of 1.8 pounds. use the cumulative Z-score table to answer the following questions. Write your answers rounded to the nearest whole number.  consider a group of 1700 newborn babies: How many would you expect to weigh between 7.36 and 8.62 pounds?  How many would you expect to weigh less than 3.76 pounds? How many would you expect to weight more than 5.65 pounds?  How many would you expect to weight between 6.1 and 7 pounds?

The mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?