It is known that people in the USA spend on average 15 hours a day using electronic devices with a standard deviation of 4.75 hours. This data follows a normal distribution. What is the probability someone spends less than 20 hours using electronic devices a day? (round your answer to 4 decimals)

Q: On the Bar Chart in Figure C1 above, which of the datasets (left, middle or right) has the highest…

A: Bar chart is given here. Error bars gives the information about how the data is spread around the…

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: Janice measures the circumferences of the trunks of trees in the woods near her house for a science…

A: The mean is 72 inches and the standard deviation is 5 inches.

Q: Determine the number of standard deviations from the mean (z-score). In the United States, the…

A: Given mean female height = 64 inches and standard devaiton = 3 inches.The distance of a data point…

Q: According to a company’s website, the top 33% of the candidates who take the entrance test will be…

A: It is given that the mean is 74 and standard deviation is 6.

Q: Suppose, you play a game, and the result is simply "win" or "lose". For every 15 games played, you…

A:

Q: If the probability of defective bolt is 0.1, find the mean and the standard deviation for the number…

A: Given the probability of a defective bolt is, 0.1 That is, p=0.1 The total number of bolts is, n=400…

Q: The budget for a window display can be modeled by an approximately normal distribution with a mean…

A: We have given that the budget for a window display can be modeled by an approximately normal…

Q: Explain why each scenario is either sample or population standard deviation. All SCAD students are…

A: Survey based question

Q: High school students across the nation compete in a financial capability challenge each year by…

A: A z-score is known as the standard score that determines how much the data point deviates from the…

Q: Exam scores have a normal distribution, with Mean of 70 and Standard deviation of 10. Bob’s score…

A: Exam scores have a normal distribution, with Mean of 70 and Standard deviation of 10. Bob’s score…

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 470…

A:

Q: The average score of all golfers for a particular course has a mean of 61 and a standard deviation…

A: From the provided information, Mean (µ) = 61 Standard deviation (σ) = 3.5 Sample size (n) = 49 Let X…

Q: Use a normal distribution table or a statistical calculator to answer this question. A farm…

A:

Q: The number of bacterial colonies on a petri dish can have an average of 2.5 per cm2 Define the…

A: Given: The number of bacterial colonies on a petri dish can have an average of 2.5 per cm.

Q: The amount of soda in a randomly selected bottle varies according to a normal distribution with mean…

A: Let x be the amount of soda in a randomly selected bottle varies which follows normal distribution…

Q: Find the standard deviation of the following numbers (Round your answer to 4 decimal places.):  1,…

A: 1, 4, 4, 7, 7, 7, 11, 11, 14, 16, 16

Q: Solve the problem. Assume that male Siberian huskies' weights are normally distributed with a mean…

A:

Q: A biologist found the wing span of a group of MONARY butterflies to be normally distributed with a…

A: