In India, four-year-olds average three hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly survey one Indian four-year-old living in a rural area. We are interested in the amount of time the child spends alone per day. 90% of the children spend at least how long per day unsupervised? (Round your answer to two decimal places.)

Q: Public health statistics indicate that 26% of  American adults smoke cigarettes. A random sample of…

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Q: The average American family of four spends $5,000 per year on food prepared at home. Assuming a…

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Q: In India, four-year-olds average three hours a day unsupervised. Most of the unsupervised children…

A: Determine the Z score for the random variable X equals 10. The Z score for the random variable X…

Q: According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a…

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Q: Two out of 8 students at a local college say that they skip dinner in the evening. Find the mean,…

A: Given that  Success of probability p =2/8=0.25 Number of trials n=20 X~binomial (n,p)

Q: A report about how American college students manage their finances includes data from a survey of…

A: Population mean = ? = 907 Sample S.D = s =205 Sample size = n =500 Sample mean = x̅ = 825

Q: The tallest living man at one time had a height of 261 cm. The shortest living man at that time had…

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Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 63.8 inches.…

A: Given data,μ=63.8σ=2.51If n=28P(X≥65.08)=?

Q: The ages of the members of a popular ski club is normally distributed with a mean of 46 years and a…

A: Given that the ages of the members of a popular ski club is normally distributed with a mean of 46…

Q: The math department at a university gives all of the students in a certain math class the same final…

A: Let  denote the student score receive in the final exam.The random variable  follows a normal…

Q: Adult Great Basin rattlesnakes have a mean length of 33.6 inches and a standard deviation of 4.8…

A: GivenFor Adult Great Basin rattlesnakesMean(μ)=33.6standard deviation(σ)=4.8sample size(n)=36For…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: A large company has many employees and the annual salaries of those employees follow a normal…

A: X follows a Normal distribution with mean = 70000 and S.D = 12000 Then z=(x-mean)/SD =…

Q: The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is…

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Q: The average height for female golden retrievers is 21.96 inches with a standard deviation of 1.77…

A: Given,mean(μ)=21.96standard deviation(σ)=1.77

Q: A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the…

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Q: The scores of students in a 40-point Mathematics achievement test are normally distributed with  a…

A: given data normal distributionσ = 3.595% of students got score between 28 and 42.mean = ?

Q: Furnace repair bills are normally distributed with a mean of 263 dollars and a standard deviation of…

A: Here, µ = 263 and σ = 25.

Q: Assume that the heights of men applying for Us Military training are normally distributed with a…

A: Given, Assume that the heights of men applying for Us Military training are normally distributed…

Q: Full-time college students report spending a mean of 29 hours per week on academic​ activities, both…

A: Givenmean(μ)=29standard deviation(σ)=4sample size(n)=64

Q: A group of friends, on average, had $300 in their wallets, with a standard deviation of $50.…

A: It is given that the mean and standard deviation are $300 and $50, respectively.

Q: Runner’s World reports that the times of finishers in a 10 km run are normally distributed with a…

A: Let us denote X=The times of finishers X follows a normal distribution with mean=61 and standard…

Q: The honors program at Brads University only except students with an entrance score exam over 400.…

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Q: A certain video game has 72% chance of sucess. During summer vacation a person plays 12 games a day.…

A: In question, Given that A certain video game has 72% chance of sucess. During summer vacation a…

Q: Assume that the heights of men applying for military academy training are normally distributed with…

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Q: It has been determined that there is a 75% chance of a person using their seatbelt when sitting in…

A: probability of a person using their seatbelt when sitting in the back seat of a car(p)=0.75sample…

Q: State the appropriate null and alternative hypotheses. Ο H μ 906 H: H 906 H: u 906 Ο H: μ 906 H:u…

A: The appropriate null and alternative hypotheses are given below: Here, µ is the true mean balance.…

Q: Find the standard error. Answer 2.8 O 16.6 O 1.96 O 0.4733 O 15.67<μ <17.53

A: Standard error=Standard deviation/sqrt(sample size)

Q: Find standard deviation of each sampling distribution

A: here  given, According to a gallup survey of boys 77% of boys had played computer games in the past…

Q: According to the American Red Cross, 11.6% of all Connecticut residents have Type B blood. A random…

A: The question is about discrete probability distributionGiven :Probability of all CT residents have…

Q: A nursery sells trees of different types and heights. These trees average 50 inches in height with a…

A: The problem is asking us to find the standard deviation for the sample mean. In statistics, the…

Q: A candy store sells about 8 million pieces of candy per day with a standard deviation of 300,000…

A: Given : Let X : Number candy that they sell in a given day           μ = 8 million i.e   Mean (μ) =…

Q: for a particular diamond mine ,80% of all the diamonds fail to qualify as gemstones grade. a random…

A: Given data, n=113 p=80%=0.80 q=1-p=0.20 Standard deviation=?

Q: Assume the annual day care cost per child is normally distributed with a mean of ​$9000 and a…

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Q: The salary for workers at a company are normally distributed with a mean of $60,000 and a standard…

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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.