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The average electric bill in a residential area is 72 dollars for the month of April. The Standard deviation is 6 dollars. If the amounts of the electric bills are normally distributed, find the probability that the mean of the bill for 15 residents will be less than 75 dollars.
By using the normal distribution to approximate the desired probability.
Find out sample standard deviation (s) of scores Gordon Golfer made on his last four rounds (determine to the nearest one tenth, or .1).
How could your answer to part (A) change if you knew returns followed a skewed distribution instead of a normal distribution? Explain.
Graph inequality. Using the test point method.
It will take 30 minutes regardless of the traffic conditions. Lynn's utility for travel time is: U(15 minutes) = 0.9, U(30 minutes) = 0.7, and U(40 minutes) = 0.2. Which route will minimize Lynn's expected travel time?
What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the followi..
The data are reported in thousands of dollars. The following data represent a ransom sample from the study. Compute the sample correlation coefficient r. Give a brief explanation of the meaning of this value.
Assuming that this probability does not change, he would like to compute the probability that he will score on 1 or more of his next 4 attempts. He should use?
Compute the mode, median and mean for the college students and compute the mode, median and mean for the parents' data
A "one-shot" device can be used only once; after use, the device (e.g. a nuclear weapon, space shuttle, automobile air bag) either is destroyed or must be rebuilt.
What is the probability that the percentage in the sample will deviate from the population percentage by no more than 7 percentage points?
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