Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 46 minutes and standard deviation 20 minutes. A researcher observed 13 students who entered the library to study. Round all answers to 4 decimal places where possible. Find the probability that the randomly selected 13 students will have a total study time less than 650 minutes.  The top 10% of the total study time for groups of 13 students will be given a sticker that says "Great dedication". What is the least total time that a group can study and still receive a sticker? minutes

Q: What is the probability that a first grade classroom of 20 students who are chosen randomly from the…

A: Given Information: Mean μ=100 Standard deviation σ=15 Sample size n=20

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A: From the provided information, The mean score of 29 students was 78. The 16 male students has mean…

Q: For a population, the mean is 275 yards with a standard deviation of 73 yards. Determine the…

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Q: The mean marks scored by 6 students in a database exam is 54.4. If a student who got 66 is also…

A: Given: old mean=54.4old n=6 An additional item 66 is added. The new mean is calculated as below: new…

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A: Given  Mean=μ=880, standard deviation=σ=44  P(X>1000)=?  Nahi te: According to Bartleby…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: Given that  Sample size n =9 Population standard deviation =3

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Q: randomly drawn from a deck of 52 cards with replacements 3456 times. Find the mean of the number of…

A: The probability of drawing heart from deck in one trail will be: p= Probability of hearts = 1352…

Q: the probability that a ball dropped from a certain height will strike the ground is 80 percent and…

A: Given: Number of trials or balls (n) = 12 Probability of success  here (p) = 0.80 Let X ~ Bin(12,…

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A: We have to find sample variance s2  and sample standard deviation...

Q: Suppose that the lengths of pregnancies are normally distributed with a mean of 274 days and a…

A: The provided information is  µ=274 σ=10 P(X>280) P(X-µσ>280-27410)=P(z>0.6000)=0.2743 (from…

Q: Suppose that IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation…

A: The IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation of 17.

Q: The mean height of male college students in a large city is 68 inches and the standard deviation is…

A: Solution

Q: ores are normally distributed with a mean of 1518 and a standard deviation of 325. If 1 SAT score…

A: Given: μ=1518, σ=325 The corresponding z-value needed to be computed is: If 1 SAT score is randomly…

Q: There were 5 members of a basketball team, who had a mean score of 12 points each per game. One of…

A: Given n=5, Xbar=12, n=4, Xbarreduced=10

Q: according to the government data the probability that a woman between the age of 25 and 29 was never…

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A: Mean () =15standard deviation () =4sample size (n)= 37

Q: Suppose that the amount of time that students spend studying in the library in one sitting is…

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A: Given: μ = 80 σ = 8 n = 25

Q: at is the probability that you could randomly

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A: Given,mean(μ)=105standard deviation(σ)=20

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A: Consider a random variable X which represents IQ of the individual.    X follows normal distribution…

Q: You are to pick 4 numbers from 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 such that the 4 numbers…

A:

Q: A card is randomly drawn from a deck of 52 card with replacement 456 times. Find the mean of the…

A: Total number of cards = 52 Number of hearts = 13 Let p = P(heart)= 13/52 = 1/4 = 0.25

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Q: For the students in a school for gifted children, scores of IQ test are normally distributed with a…

A: Given,sample size(n)=36 mean(μ)=114standard deviation(σ)=18

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A: Formula : Z =(X - μ)/σ

Q: A local firm reported that an American family of four washes an average of 2000 pounds of clothes…

A:

Q: t is known that the average time required to complete a test exam is 80 minutes and the standard…

A: Given Information: Mean μ=80 min Standard deviation σ=10 min. To find how many minutes should the…

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A:

Q: If the gondola is filled with 25 randomly selected​ skiers, what is the probability that their mean…

A: Mean = 180 Standard deviation = 44 Sample size = 25

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Q: The national average SAT schore was found to be a 2140 with a standard deviation of 892. If the…

A:

Q: Two thousand students took an exam. The scores on this exam are Normally distributed with mean =81…

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A: From the provided information, Mean (µ) = 210 minutes Standard deviation (σ) = 45 minutes X~N (210,…

Q: If the mean of examination scores for two classes of the same level: A and B, in a certain school…

A:

Q: There are eight patients waiting in a doctor's waiting room.  They have been waiting for 9 minutes,…

A: Let us denote the waiting times as X. X 9 2 5 4 12 7 8 11 Consider, the mean of X is, X¯=∑Xn…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.