The following data represent the number of people aged 25 to 64 years covered by health insurance (private or government) in 2018. Approximate the mean a standard deviation for age. Age Number (millions) 25-34 35-44 45-54 55-64 22.6 35.7 35.3 25.3

What is the standard deviation?

The top 14 speeds, in miles per hour, for Pro-Stock drag racing over the past two decades are listed below. Find the mean speed 191.3 181.1 202.2 190.1 201.4 201.4 192.2 201.2 193.2 201.2 194.5 199.2 196.0 196.2 O A. 196.1 O B. 181.1 O C. 202.2 Question Viewer O D. 195.8

The mean age of two people in a room is 20 years.  A 50 year old person enters the room. What is the mean age of the 3 people in the room now 20 30 33.3 35 none of the above

Identify the statistic that is used to estimate a. a population mean.b. a population standard deviation.

The age of student at a university are normally distributed with a mean of 20. What percentage of the student body is at least 20 years old?

Find the mean and standard deviation of the following numbers:  35,18,12,32,35,75,32,26,18

A survey is conducted on 700 Californians older than 30 years of age. The study wants to obtain inference on the relationship between years of education and yearly income in dollars. The response variable is income in dollars and the explanatory variable is years of education. A simple linear regression model is fit, and the output from R is below: Im(formula = Income ~ Education, data = CA) Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 25200.25 1488.94 16.93 3.08e-10 *** Education 2905.35 112.61 25.80 1.49e-12 *** Residual standard error: 32400 on 698 degrees of freedom Multiple R-squared: 0.7602

A retail survey asked college students how much they planned to spend in various categories during the upcoming academic year. One category is the amount students planned to spend on school supplies. The data below show the amount of money students planned to spend on school supplies. 58, 60, 67, 69, 70, 73, 74, 77, 78, 80, 83, 84, 87, 89, 94, 96, 97, 100, 102, 105 USE SALT (a) Calculate the mean and median for the distribution of money students planned to spend on school supplies. mean median (b) What is the 75th percentile of the distribution? (c) Determine the five-number summary. minimum Q₁ median Q3 maximum

Consider the following data of 10 exams scores: 28, 57, 58, 64, 69, 74, 79, 80, 83, 85 1. The the mean, median, and mode       2. find the standard deviation without a graphing calculator. Show all your computations