4.74 Scores on an ex am ination are a ssum ed to be norm ally distributed with mean 78 and variance 36.a. Whatis the probability that a person takingthe ex amination scoreshigher than 72?b. Suppose that students scoring in the top 10% of this distribution are to receive an A grade. What is the m inim um score astudent must achieve to eam an A grade?c. Whatmust be the cutoff point for passing the ex am ination if the ex am inerwants only the top 28.1% of all scores to bepassing?d. Approx im ately what proportion of studentshave scores 5 or m ore points above the score that cuts off the lowest 25%?e. RStudio Exercise Answer parts(a)(d), using R Studio.f. Ifit is known that a student's score ex ceeds 72, whatis the probability that his or her score ex ceeds 84?

Let X denote the scores on examination. Given that X follows N(mean = 78, SD = 6), then Z = (X -…

Answered: a. Whatis the probability that a person…

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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a.) The probability that the sample mean weight of this sample of 20 is greater than 9.75 is _____? b.) The probability that the sample mean weight of this sample of 20 is between 9.75 and 9.89 is ____? c.) There is only a 5% chance that the average weight of a sample of these 20 cheese wedges will be below _____ (answer the blanks)
The class I'm taking is statistics! I am completely stuck. Need help. I have attached the problem. Please view attachment before answering. Thank you!
The probability is 0.4 that a traffic fatality involves an intoxicated or alcohol-impaired driver or nonoccupant. In six traffic fatalities, find the probability that the number, Y, which involve an intoxicated or alcohol-impaired driver or nonoccupant is a. exactly three; at least three; at most three. b. between two and four, inclusive. c. Find and interpret the mean of the random variable Y. a. The probability that exactly three traffic fatalities involve an intoxicated or alcohol-impaired driver or nonoccupant is nothing. (Round to four decimal places as needed.) The probability that at least three traffic fatalities involve an intoxicated or alcohol-impaired driver or nonoccupant is nothing. (Round to four decimal places as needed.) The probability that at most three traffic fatalities involve an intoxicated or alcohol-impaired driver or nonoccupant is nothing. (Round to four decimal places as needed.) b. The probability that between two and four…
Suppose that 30 percent of an adult population have an infectious disease and 40 percent have achronic disease. Assume that having an infectious disease is independent from having a chronicdisease. For each of the questions below perform the calculation using appropriate statisticalnotation.a. What is the probability that a person selected at random will have both diseases?b. What is the probability of having the infectious disease for people with the chronic disease?c. What is the probability of having the infectious disease for people without the chronic disease?d. What is the probability of not having the infectious disease for people with the chronicdisease?
The following table gives data on the marital status of women aged 25 to 29. These proportions tell us the probability of the marital status of a randomly selected woman. Marital Status Never Married Married Widowed Divorced Proportion ??? 0.494 0.005 0.046 1) What percentage of women aged 25 to 29 have never been married? 2) What is the probability that a randomly chosen woman is not currently married?
The bottom panel of figure 1 (p. 311) shows the probability histogram for the total number of spots when a pair of dice are rolled. (a) The chance that the total number of spots will be between 7 and 10 (inclusive) equals the area under the histogram between ___and ___ (b) The chance that the total number of spots will be 7 equals the area under the histogram between ___ and ____

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