The average number of miles (in thousands) that a car's tire will function before needing replacement is 74 and the standard deviation is 11. Suppose that 17 randomly selected tires are tested. Round all answers to 4 decimal places where possible and assume a normal distribution. What is the distribution of X? What is the distribution of ¯x?

Approximate the population mean and standard deviation of age for males. By the way, we are subtractibg vertically to get the midpoints (ex: 0+10/2=5, 10+20/5=15).

Suppose X is normally distributed with mean ?=56 and standard deviation ?= 7. Calculate the z-score for a data value of x = 62.93. Round your answer to 2 decimal places.

Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 260 feet and a standard deviation of 40 feet. We randomly sample 49 fly balls.

Yearly snow fall of a certain town follows a normal distribution with a mean of 37 inches and a standard deviation of 2.5 inches.  What is the z-score if in 2007 the snowfall was 40 inches?

On average indoor cats live to 14yrs oldvwith a standard deviation of 2.4 yrs.Suppose the distribution is normal.Let X = the age at death of a randomly selected indoor cat.Round answers 4 decimal places where possible. The middle 30 % of indoor cats age of death lies between what two numbers? Low=   yrs High=    yrs

Suppose a team of biologists has been studying a fishing pond. Let x represent the length of a single trout taken at random from the pond. This group of biologists has determined that x (trout length) has a normal distribution with mean (mu) 10.5 inches and standard deviation (sigma) 1.2 inches. Use calculator command (normalcdf) to find your answer. Show your work by writing the command and numbers that you input. Round your answer to 4 decimal places.  What is the probability that  the length of a single trout taken at random from the pond is between 7 and 11 inches long? What is the probability that the mean length of five trout taken at random is between 7 and 11 inches?

The mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?

Use the formula to find the standard error of the distribution of differences in sample means, x⎯⎯1−x⎯⎯2x¯1-x¯2.Samples of size 40 from Population 1 with mean 3.7 and standard deviation 1.9 and samples of size 40 from Population 2 with mean 1.9 and standard deviation 1.2Round your answer for the standard error to two decimal places.standard error = Enter your answer in accordance to the question statement

i already have answer in question A-D. please help me to solve the rest. topic is unkown standard deviation