A statistics professor gives a survey to each of the 100 students in an introductory statistics lecture. The survey asks the students to estimate when they typically wake up on weekdays. The data are recorded in terms of the number of hours after midnight the students wake up. The data are included below. Use Excel to calculate the population standard deviation and the population variance. Round your answers to three decimal places. Do not round until you've calculated your final answer "Wake up time" 67.5787.568.57.58.578.56.59986.57.5756.56.5786.585.5666.57.56.5776.576.57.57.576.577.56.566.55.576.5856.5766.5776.566.56.5658.577.57.57.576867.56.55.55.57.56.5678677786.55.577675.5677.577.567.57 Standard deviation =  Variance =

A student takes a multiple-choice test that has 6 questions. Each question has four choices. The student guesses randomly at each answer. Round the answers to three decimal places. Find P(4 correct answers) b. Find (more than 1 correct answer) c. Find mean and standard deviation

SOLVE IN EXCEL PLEASE STEP BY STEP INSTRUCTIONS: Calculate the measures of central tendency (mean, median, and mode) and the measures of dispersion (range, mean, standard deviation, and variance) in the examples: 7. The monthly salaries (in dollars) of a group of teachers at a university are as follows: 240, 600, 320, 450, 600, 240, 240, 320. Find the range of the dispersion, the arithmetic mean, and the deviation. population standard of these data. Xi 240 320 450 600 Tip: We write down in a table the given data arranged in ascending order, the calculations and the results obtained: fi 3 Σ= 3.5 3 2.5 2 1.5 1 0.5 O O= fi/n 3/8 = 0,375 Σ= fi The range of the dispersion is: r = The arithmetic mean is: x = 240 The population mean deviation is: xifi 720 320 x₁ - x 376,25 -136,25 X 450 Dollars. Dollars. Dollars (x₁ - x)² 18564,0625 600 Xi (x₁ - x)² fi/n 6961,52 Σ=20948,44

The ages (in years) and heights (in inches) of all pitchers for a baseball team are listed. Find the coefficient of variation for each of the two data sets. Then compare the results. E Click the icon to view the data sets. C/neights = % (Round to one decimal place as needed.)

Place the following in order to show how you find the standard deviation. Take the square root of the mean. Find the mean for the set of data. Subtract each data value from the mean Square the difference of the two Find the mean of the squared difference

In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores fall between 70 and 84. What are the mean and standard deviation for this data? What is the mean: What is the standard deviation

The scores and their percent of the final grade for a statistics student are given. What is the student's weighted mean score? Score Percent of final grade Homework 82 10 Quiz 88 Quiz 96 Project 98 50 Final Exam 92 30 The student's weighted mean score is (Simplify your answer. Round to two decimal places as needed.) Enter your answer in the answer box.

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Use the dotplot to find the mean, median, and IQR. Round to 1 decimal place, if needed. Caution: This could be a different data set than the one in the previous question. 74 76 78 80 82 84 86 Heights of Basketball Players mean median IQR (in inches) (in inches) (in inches)

For the special Thanksgiving edition of the local newspaper, a reporter wrote a heartwarming piece. In the piece there appeared figures on the number of turkey dinners served by various local charities. The histogram below summarizes the data. Use the histogram to answer each of the questions. Frequency (Number of charities) 10- 9. 8 7 5. 3 2 1 90 to 139 140 to 189 190 to 239 240 to 289 Number of turkey dinners (a) What is the class width? (b) According to the histogram, what is the total number of charities? (c) How many charities served from 190 to 239 turkey dinners? O