McPhilly is conducting a study on the amount of money a customer spends on each visit to the restaurant. The company looks at 20 receipts from each McPhilly. The company found that the mean amount spent is $11 with a $3 standard deviation. a. What type of sampling method was used? b. What is the probability that a customer spend less than $8 each visit? c. What is the probability that a customer spends more than $13 each visit?

Find the mean and standard deviation of the number of red-headed Scots in a randomly selected group of 155. The probability of having red hair is still 13% for Scottish people. a. Mean = b. Standard deviation (Round to 2 places)=

Please don't provide handwritttin solution....

A pollster wants to know the average income of those who supported John McCain for president. He asks 100 supporters and calculates a mean of​ $67,543. Is this mean x overbar   or mu ​?   A. mu ​, because it is calculated based off data from the entire population..   B. x overbar ​, because it is calculated based off data from the entire population.   C. mu ​, because it is calculated based off data from a sample.   D. x overbar ​, because it is calculated based off data from a sample.

The tourist bureau of the Caribbean Island survey a sample of 6 United States tourists as they left to return home. The tourist was asked how many days they spent on their visits. Their responses were as follows: 11,8,6,12,10,7 find the standard deviation of this sample of numbers.

Suppose six pet food stores in the area were surveyed, and the following data shows how many types of pet food each of them carries. 7,7,9, 9, 11, 11 Calculate the sample mean and the sample standard deviation. Round your answers to three decimal places. T = Number Number S=

Bill received the following scores on his quizzes 54, 67, 78, 73, 92, 86, 78, 79, 81, 72 what is the mean, range, standard deviation, mode,  median and variance? does the score 54 seem unusual? Why or why not?

​Recently, a random sample of 13–18 year olds was​ asked, "How much do you currently have in​ savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings.   LOADING... Click the icon to view the frequency distribution for the amount of savings. Savings Frequency   ​$0– ​$199 343 ​$200– ​$399 94 ​$400– ​$599 62 ​$600– ​$799 21 ​$800– ​$999 9 ​$1000– ​$1199 5 ​$1200– ​$1399 3 The sample mean amount of savings is ​$nothing. ​(Round to the nearest dollar as​ needed.) The sample standard deviation is ​$nothing. ​(Round to the nearest dollar as​ needed.)

An insurance company crashed four cars of the same model at 5 miles per hour. The costs of repair for each of the four crashes were $444, $447, $470, and $207 O. Compute the mean, median, and mode cost of repair. Compute the mean cost of repair. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The mean cost of repair is $ (Round to the nearest cent as needed.) O B. The mean does not exist. Compute the median cost of repair. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The median cost of repair is $ (Round to the nearest cent as needed.) O B. The median does not exist. Compute the mode cost of repair. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The mode cost of repair is $ (Round to the nearest cent as needed.) O B. The mode does not exist.

what was the age distribution of prehistoric Native America? Extensive , anthropological studies in the southwestern United states gave the following information about a prehistoric extended family group of 82  members on what is now a native american reservation. for this community, estimate the mean age expressed in years, the sample variance, and the sample deviation. For the class 31 and over, use 35.5 as the class midpoint. 39,16, 20,7