Standard Deviation Answers

Which formula is used to calculate the standard deviation of sample data?

The test scores of a geometry class are given below.90, 75, 72, 88, 85The teacher wants to find the variance for the class population. What is the value of the numerator of the calculation of the variance?Variance:

Yuri computes the mean and standard deviation for the sample data set 12, 14, 9, and 21. He finds the mean is 14. His steps for finding the standard deviation are below.What is the first error he made in computing the standard deviation?

A poll worker analyzing the ages of voters found that and . What is a possible voter age that would give her zx = 1.14? Round your answer to the nearest whole number.

Fiona recorded the number of miles she biked each day last week as shown below.4, 7, 4, 10, 5The mean is given by m = 6. Which equation shows the variance for the number of miles Fiona biked last week?

The weekly salaries of a sample of employees at the local bank are given in the table below.EmployeeWeekly SalaryAnja$245Raz$300Natalie$325Mic$465Paul$100What is the variance for the data?Variance:

Abby is collecting rainfall data. She finds that one value of the data set is a high-value outlier. Which statement must be true?

The mean of a set of credit scores is and . Which credit score is within a z-score of 3.3?

A scientist collected two sample sets of snowfall data. Which statistic should he use to compare the spread of the two sets of data?

The monthly mean salaries and standard deviations of four college students are given below.StudentMeanStandard DeviationClarissa$34512.53Abi$5988.99Kaila$81215.29Shenika$2087.67Which statement must be true?