The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 34.9 seconds and a standard deviation of 6.9 seconds.   a) What is the probability that a randomly chosen student completes the activity in less than 27.9 seconds? Round to 3 decimal places. Incorrect b) What is the probability that a randomly chosen student completes the activity in more than 39.5 seconds? Round to 3 decimal places.  c) What proportion of students take between 28.7 and 38.8 seconds to complete the activity? Round to 3 decimal places.  d) 70% of all students finish the activity in less than  seconds. Round to 1 decimal place.

Q: Some believe that captain America can run the fastest mile of any person alive. In order to test…

A: The mean is 138 seconds and the 16 seconds.

Q: The average income in the city of Red Deer is $85,000 with a standard deviation of $20,000.  A…

A: It is given that the mean is $85,000 and the standard deviation is $20,000.

Q: The lifetime of lightbulbs has a mean of 1500 hours and a standard deviation of 175 hours. A sample…

A:

Q: A researcher showed the mean of weights of college football players to be 200 pounds with a standard…

A:

Q: The monthly utility bills in a city are normally distributed with a mean of $100 and a standard…

A:

Q: Resting body temperatures are normally distributed with an average of 98.25 degrees Fahrenheit and a…

A: Let X be the random variable for body temperatures. X~Nμ, σ Where, Mean, μ= 98.25Standard deviation,…

Q: Researchers have observed that regular smokers have an average life span of 68 years that is…

A: Let X be the random variable from normal distribution with mean (μ) = 68 and standard deviation (σ)…

Q: A physical fitness association is including the mile run in its secondary-school fitness test. The…

A: Let "X" be the time taken by a boy in secondary school to run a mile.

Q: The body temperatures of all mosquitoes in a county have a mean of 57∘F and a standard deviation of…

A:

Q: The average price for an acre of land is $20,000 with a standard deviation of $2500.  What is the…

A: From the provided information, Mean (µ) = 20000 Standard deviation (σ) = 2500 X~N (20000, 2500)

Q: The weights of ice cream cartons are normally distributed with a mean weight of 11 ounces and a…

A: Given : μ=11 ounceσ=0.6 ounceX~N(μ=11,σ2=0.62)Let, for sample of size n,x¯~Nμx¯=μ,σx¯2=σn2

Q: You need to call a plumber to fix a leak. Assume that the prices they quote are normally distributed…

A: Given, X~N150,202 μ=150σ=20n=100

Q: A professor knows that her statistics students' final exam scores have a mean of 79 and a standard…

A:

Q: A professor knows that her statistics students' final exam scores have a mean of 75 and a standard…

A: From the given information, μ=75σ=12.2 In his class, an "A" is any exam score of 90 or higher.…

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

A: Mean()=57standard deviation()=3.5

Q: Yoonie is a personnel manager in a large corporation. Each month she must review the employees in…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given The data is as follows: Population mean, μ=1.85 Population sd, σ=0.95 Sample size, n=55

Q: The amount of tip the servers in an exclusive restaurant receive per shift is normally distributed…

A: Let X be a random variable representing the amount of tip the servers in an exclusive restaurant…

Q: 3.) The amount of tip the waiters in an exclusive restaurant receive per shift is normally…

A: It is an important part of statistics. It is widely used.

Q: 5. Heights of trees in a forest are normally distributed with mean 50 feet and standard deviation 12…

A: Given, µ=50 σ=12 n=36 Let x be the height of trees in the forest.

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.