F.%24Suppose that the amount of time that students spend studying in the library in one sitting is normallydistributed with mean 40 minutes and standard deviation 17 minutes. A researcher observed 49 studentswho entered the library to study. Round all answers to 4 decimal places where possible.a. What is the distribution of X? X - Nb. What is the distribution of I? N(c. What is the distribution of r? ) - N(d. If one randomly selected student is timed, find the probability that this student's time will betorio)between 37 and 39 minutes.e. For the 49 students, find the probability that their average time studying is between 37 and 39minutes.f. Find the probability that the randomly selected 49 students will have a total study time less than1813 minutes.g. For part e) and f), is the assumption of normal necessary? O NoO Yesh. The top 20% of the total study time for groups of 49 students will be given.a sticker that says "Greatdedication". What is the least total time that a group can study and still receive a sticker?otebookSəA OONminuteseckdesmos-graph.png1s米I14%233.4.6.7.8.6.E.T.P.G.H.K.C.B.

Answered: Image /qna-images/answer/71df9940-64e5-45e7-8c2c-c5ea8707d706.jpg

Answered: Suppose that the amount of time that…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a sample of n = 56 observations The sum of x is ∑x = 4135 The sum of x² is ∑x² = 315647 15 Suppose one of the observations in the data set in the previous question is x = 88. This data point deviates from the mean by ______ standard deviations. a 1.03 b 1.15 c 1.28 d 1.42
The average amount that people spend on take-out on Fridays is $67, and the standard deviation is $13. Assume that the distribution of money spent on take-out is normal, and suppose that the amount spent by 69 randomly selected people are recorded. Answer the following questions. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X N b. What is the distribution of x? a N( c. For the sample of 69 people, find the probability that the average amount spent is between $66 and $70. > Next Question P Type here to search 立

Shaded diagram.. 3. The random variable X has a normal distribution with mean 80 and standard deviation 6. Choose random samples of size 40 from this distribution. Let X be the random variable of sample means. (5) a. What is the distribution of X ? (5) b. What is the mean of X ? y
The estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in the pie chart. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Use 70 as the midpoint for "65 years and over." ... The sample standard deviation is s = as needed.) Under 4 years: 23.3 5-14 years: 42.4 15-19 years: 19.2 20-24 years: 23.5 25-34 years: 43.5 35-44 years: 40.3 45-64 years: 81.8 65 years and over: 52.9 (Round to two decimal places
please help with abc
Ch 8 FRQ ( The distribution of average speeds of the top 53 drivers in NASCAR is roughly symmetric, unimodal, and bell-shaped, with a mean of 184.8 mph and a standard deviation of 7.2 mph. In the space above, draw a Normal Curve, from z=-3 to z=+3. Draw vertical lines at the mean and each whole number standard deviation above and below the mean. Write two rows of numbers under the base line; one row with the number of standard deviations above and below the mean (z-scores), and a row under that with the actual values for this problem. ] What percent of drivers would you expect to have speeds below 199.2 mph ? Show all work. s] What is the area under the curve to the left of a speed of 170.4mph Show all work. What is the probability that a driver selected at random will have a speed below 172.0 mph ? Show all work. B] What percent of drivers would you expect to have a speed above 177.0 mph ? Show all work. How many drivers would you expect to have speeds between 170.4 mph and 177.0 mph…
Please only answer b c d
Parts a and c
I answered A,B AND C. I NEED HELP TO SOLVE PROBLEM NUMBER D,E AND F ONLY
B Choosing a topic Sk.. For data that is not normally distributed we can't use z-scores. However, there is an equation that works on any distribution. It's called Chebyshev's formula. The formula 1 where p is the minimum percentage of scores that fall within k k2 is p = 1 - standard deviations on both sides of the mean. Use this formula to answer the following questions. a) If you have scores and you don't know if they are normally distributed, find the minimum percentage of scores that fall within 2.2 standard deviations on both sides of the mean? b) If you have scores that are normally distributed, find the percentage of scores that fall within 2.2 standard deviations on both sides of the mean? c) If you have scores and you don't know if they are normally distributed, how many standard deviations on both sides of the mean do we need to go to have 64 percent of the scores? Note: To answer part c you will need to solve the equation for k.

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