Fast-Food Bills for Drive-Thru Customers A random sample of 47 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $18.9 per car. The population standard deviation is $5.60. Estimate the mean bill for all cars from the drive-thru with 93% confidence. Round intermediate and final answers to two decimal places. 24 <µ< $

Solve the problem. Round to the nearest tenth. min one region, the September energy consumption levels for single family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find which is the consumption level separating the bottom 45% from the top 55%.

Use the normal distribution of SAT critical reading scores for which the mean is 514 and the standard deviation is 115. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 650​? (b) If 1000 SAT verbal scores are randomly​ selected, about how many would you expect to be greater than 550​? Click to view page 1 of the standard normal table. LOADING... Click to view page 2 of the standard normal table. LOADING...       Question content area bottom Part 1 (a) Approximately 1.181.18​% of the SAT verbal scores are less than 650. ​(Round to two decimal places as​ needed.) Part 2 (b) You would expect that approximately 0.880.88 SAT verbal scores would be greater than 550. ​(Round to the nearest whole number as​ needed.)

An insurance company is looking over accident statistics. They want to model the population of all drivers for the population parameter of the standard deviation and variance of the age of the driver involved in an automobile accident. They have a sample of 100 accidents from around the country. The age of the driver in each of these accidents is provided below. Use Excel to calculate the sample standard deviation and the sample variance. Round your answers to one decimal place. Do not round until you've calculated your final answer "Age of people in accident"48643346436728189044472440202747683248472248217347302918487364454920205066654187873417203176493089672222455023481746382942254720463119214227226621236675744621461969202048238851284918204522313823284939   Standard deviation:  Variance:

Reading Improvement Program To help students improve their reading, a school district decides to implement a reading program. It is to be administered to the bottom 9% of the students in the district, based on the scores on a reading achievement exam. If the average score for the students in the district is 121.5, find the cutoff score that will make a student eligible for the program. The standard deviation is 15. Assume the variable is normally distributed. Round z-value calculations to 2 decimal places and the final answer to the nearest whole number. Cutoff score=

The distribution of heights in a population of women is approximately normal. Sixteen percent of the women have heights less than 62 inches. About 97.5% of the women have heights less than 71 inches. Use the empirical rule to estimate the mean and standard deviation of the heights in this population. Mean: K inches Standard Deviation: inches

In a normal distribution, ____ of the distribution lies within one standard deviation of the mean. 50%. 68%. 95%. 99.7%.

Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 71 miles per​ hour, with a standard deviation of 5 miles per hour. Estimate the percent of vehicles whose speeds are between 61 miles per hour and 81 miles per hour.​ (Assume the data set has a​ bell-shaped distribution.)   Approximately ________ ​% of vehicles travel between 61 miles per hour and 81 miles per hour.

In a normal curve, the percentage of the scores between one and two standard deviations above the mean is approximately __________.   Select one: a. 14% b. 50% c. It is impossible to tell. d. 2% Clear my choice

Most people think that the​ "normal" adult body temperature is 98.6degrees°F. In a more recent​ study, researchers reported that a more accurate figure may be 98.198.1degrees°F. ​Furthermore, the standard deviation appeared to be around 0.60.6degrees°F. Assume that a Normal model is appropriate. Complete parts a through c below.       Question content area bottom Part 1 ​a) In what interval would you expect most​ people's body temperatures to​ be? Explain. Select the correct choice below and fill in the answer​ box(es) to complete your choice.     A. Using the​ 68-95-99.7 Rule, about​ 95% of the body temperatures are expected to be less than enter your response heredegrees°F. ​(Round to one decimal place as​ needed.)   B. Using the​ 68-95-99.7 Rule, about​ 95% of the body temperatures are expected to be between enter your response heredegrees°F and enter your response heredegrees°F. ​(Use ascending order. Round to one decimal place as​ needed.)   C. Using the​…