Total area under a frequency curve
Three squares inches out of the total area under a frequency curve of 12 square inches falls below a score of 68. If the curve is based on a total of 80 cases, how many cases fall below a score of 68?
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Before date of trip, 8 more people joined tour decreasing price by $6 per person. Determine original number of tourists in group and original price per person.
The participants in a television quiz show are picked for a large pool of applicants with approximately equal numbers of men and women. Among the last 10 participants there have been only 2 women.
A frequency curve is constructed from test scores of 200 students. Sixty percent of total area under the curve falls between test scores of 25 and 45. How many students have scores between 25 and 45?
Cars arriving for gasoline at the Shell station follow Poisson distribution with mean of 10 per hour. Calculate the probability that in the next 3 hours, more than 25 cars will arrive.
Three squares inches out of total area under frequency curve of 12 square inches falls below score of 68. If the curve is based upon a total of 80 cases, how many cases fall below score of 68?
Suppose that probability distribution of lifetimes of participants is approximately the normal distribution with mean of 71 years and standard deviation of 3.5 years. What proportion of plan participants are expected to see 75th birthday?
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work.
Based upon a sample size of 511 teens, it is estimated that the proportions of teens who support the legal drinking age at 21 is p=0.64. It is also reported that the margin of error of this estimate is 4%. Show how the reported value for margin of
Using the estimation given above, estimate the sample size needed to determine the proportion of people who wants internet to in 0.02 with 95% confidence.
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