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There are 40 students in an elementary statistics class. On the basis of years of experience, the instructor knows that the time needed to grade a randomly chosen exam paper is a random variable with an expected value of 6 minutes and a standard deviation of 6 minutes.
(a) If grading times are independent and the instructor begins grading at 6:50PM and grades continuously, what is the (approximate) probability that he is nished grading before the 11:00PM TV news begins?
(b) If the sports report begins at 11:10, what is the probability that he misses part of the report if she waits until grading is done before turning on the TV?
assume that a sample is drawn and za2 1.65 and s 35. answer the following questionsa if the maximum error of estimate
In a recent study of incomes in Allegheny county in Pennsylvania it was found that distribution of family incomes is skew to the right. what can we say about the relationship between mean and median?
A firm has tendered for two independent contracts. It estimates that it has probability 0.4 of obtaining contract A, and probability 0.1 of obtaining contract B. Find the probability that the firm:
Your supervisor has asked you to conduct a survey about consumers' buying habits. For this task, you surveyed 100 men and 100 women at a local shopping mall.
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
three identical chips each with 0 on one side and 1 on the other are to be tossed simultaneously.a. writes the sample
Assume each lifetime is independent. Round your answer to four decimal places (e.g. 98.7654). What is the probability that the lathe will operate at least seven years?
question given the following analysis of variance table for three treatments each with six
Suppose observations on 50 vehicles yielded a sample mean of 65 mph. Assume that the standard deviation of vehicle speed is known to be 6 mph. Determine the two-sided 99% confidence intervals of the mean speed.
Suppose that by the end of 2009, that percentage was 85%. If a sample of 10 U.S. adults is selected, what is the probability
Select either the Least Squares Method, the Moving Average Method, or the Weighted Moving Average and provide step-by-step instructions you would employ to plot the associated trend line.
Find the standard normal area for each of the following: (Round the answers to 4 decimal places.)
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