A jar contains 11 red marbles, 12 blue marbles, and 6 white marbles. Four marbles from this jar are selected, with each marble being replaced after each selection. What is the standard deviation of X, the number of draws until the first red marble? O 0.4852 O 0.9704 2.0770 O 1.5172

Find the standard deviation of the following numbers (Round your answer to 4 decimal places.):  1, 4, 4, 7, 7, 7, 11, 11, 14, 16, 16

Calculate the standard deviation of the following set of numbers (show your work): 5 5 7 8 10

Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. Find P9, the 69-percentile. This is the temperature reading separating the bottom 69% from the top 31%. P69 %3D

A quiz consists of 40 multiple choice​ questions, each with five possible​ answers, only one of which is correct. If a student guesses on each​ question, what is the mean and standard deviation of the number of correct​ answers? Round to the nearest thousandth.

The NJ Department of Health has reported the average life span of NJ residents is 81 years. If the standard deviation is σ = 4 years, what is the probability of a person living to at least 92 years of age?

Find the standard deviation of workers with no drug problem from the sample. (Round your answer to the nearest hundredth)

John's answering machine receives about 6 telephone calls between 8:00 am and 8:00 pm. Let X = the number of phone calls received between 1:00 pm to 5:00 pm. What is the standard deviation of X?

How long do people spend travelling to work?the answer may depend on where they live.here are the travel times in minutes for 15workers in north Carolina.chosen at random by census bureau: 5 10 10 10 10 12 15 20 20 25 30 30 40 40 60 What is the standard deviation for travel time for these 15north Carolina workers

Three students were applying to the same graduate school. They came from schools with different grading systems. Vichet is Kamala is Number Number Student GPA School Average GPA School Standard Deviation Thuy 2.4 2.2 0.5 Vichet 85 96 How many standard deviations is each student away from hiir school average? If the student GPA is higher than his school average, enter this as a positive number. If the student GPA is lower than his school average, enter this as a negative number. Thuy is Number Kamala 8.7 8.2 Table 2.74 20 0.8 standard deviations from Thuy's school average. standard deviations from Vichet's school average. standard deviations from Kamala's school average.