The mean number of minutes for app engagement by a tablet user is 8.2 minutes. Suppose the standard deviation is one minute. Take a sample of size 70. a. What are the mean and standard deviation for the sums? b. Find the 95th percentile for the sum of the sample. Interpret this value in a complete sentence. c. Find the probability that the sum of the sample is at least ten hours.

Q: 6. The size of fish is very important to commercial fishing. A study conducted in 2012 found the…

A: From the provided information, Mean (µ) = 42.1 cm Standard deviation (σ) = 2.98 cm X~N (42.1, 2.98)…

Q: A vending machine dispenses coffee into an eight-ounce cup. The amount of coffee dispensed into the…

A: Given standard deviation(σ)=0.03

Q: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation…

A: (a)   Obtain the probability that pregnancy will last 307 days or longer. The probability that…

Q: In a neighborhood donut shop, one type of donut has 330 calories, three types of donuts have 400…

A: In a donut shop one type of donut has 330 caloriesthree types of donuts have 400 caloriessix types…

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: The average price of a college math textbook is $168 and the standard deviation is $20. Suppose that…

A: The average price of a college math textbook is $168 and the standard deviation is $20. Suppose that…

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: he IQ of a person follows a normal distribution and has a mean of 100 and a standard deviation of…

A: Given that  The data is normally distributed with  Mean (μ) = 100 Standard deviation (σ) = 15   We…

Q: The ACT math scores of a particular high school in New Jersey are approximately normally…

A: Given that 99.7% of the scores, centered about the mean, are between 200 points and 800 points. So…

Q: IQ test scores are normally distributed with a mean of 98 and a standard deviation of 16. An​…

A:

Q: Below represents the amounts that a random sample of employees reported that they spent on dinner…

A:

Q: The lengths of pregnancies are normally distributed with a mean of 269 days and a standard deviation…

A: Given: μ=269 and σ=15. a)PX≥308=PX-μσ≥308-μσ=PZ≥308-26915=PZ≥2.6=1-PZ<2.6=1-0.9953=0.0047…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.2…

A:

Q: The percent of fat calories that a person in America consumes each day is normally distributed with…

A:

Q: Approximately 6% of American drivers d not text while they drive. Suppose you are working with a…

A: The given situation fits binomial distribution as there are 300 independent trials (300 people),…

Q: Please show all diagrams and work. Circle your answers. 1. The average weight of an NFL player is…

A:

Q: Provide an appropriate response. Use the Standard Normal Table to find the probability.   IQ test…

A: Solution :- Given data :- μ = 105σ = 13x ^ = 122 Using Z-Score Formula :- z=x^-μσ

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

A:

Q: According to BusinessWeek, 44% of advertisers claim they have been a victim of internet click fraud.…

A: The mean is, μ=np=120×0.44=52.8 The mean is 52.8. The standard deviation is,…

Q: Solve the problem. Assume that mountain lions' weights are normally distributed with a mean of 62.6…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 62.6 ,…

Q: Regardless of the kind of workout a gym goer does, the mean time spent on the treadmill is 45…

A: Given,sample size(n)=36mean(μ)=45standard deviation(σ)=15

Q: The mean height of men in the United States is 69 and the standard deviation is 2.7 inches. The…

A: Given, For menMean height, = 69 inchesStandard deviation,  = 3 inchesFor womenMean height, = 64…

Q: Find the range, the standard deviation, and the variance for the given samples. Round non-integers…

A: Given data is74,80,76,70,69,87,59,66,52Arrange the data in ascending…

Q: Find the range, the standard deviation, and the variance for the given samples. Round non-integer…

A: First step is to arrange the data in ascending order (smallest to largest). 45 ,51, 61 , 64 , 66 ,…

Q: Find the range, the standard deviation, and the variance for the given samples. Round non-integer…

A: