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Define and mention characteristics of normal probablity curve,Distinguish a group of 500 people into three groups assuming that the attribute of grouping is normally distributed. In a statistic class, 10 scores were randomly selected with the following results were obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, and 66. What is the third quartile?
Let x equal the number of cells activating the alarm when the temperature reaches 100F. Find the expected value and the variance for the random variable x.
If the gender-selection method has no effect and boys and girls are equally likely, find the mean number of boys born in groups of 152. Round to the nearest whole number.
Assuming that a plane make a safe flight if at least one-half of its engines run, determine whether a 4-engine plane or 2-engine plane has the higher probability for a succe
Construct a 99 percent confidence interval for the mean commission earned by local Tupperware dealers. You may assume the commissions are normally distributed.
Suppose you are in a class of 120 students. What is the probability that at most 42 students will say that they frequently experience stress in their daily lives?
If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the
If another sample of 1000 companies is taken, do you expect the sample mean to be 7.2 again? Why or why not? Repeating this experiment many times with different samples.
Compute the probability of receiving four calls in a five-minute interval of time. Compute the probability of receiving more than 10 calls in a five-minute interval of time.
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