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Fifty percent of the people that get mail-order catalogs order something. Find the probability that only four of the 10 people getting these catalogs will order something.
Statistics and Probability, Statistics
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A rainstorm in Portland, Oregon, wiped out the electricity in 10% of the households in the city. Suppose that a random sample of 70 Portland households is taken after the rainstorm. Estimate the number of households in t ...
Given the following values: = 20, M = 16, = 0.7, conduct a one-sample z test at a .05 level of significance. What is the decision for a two-tailed test? A) to reject the null hypothesis B) to retain the null hypothesis C ...
15-18 years 4 19-22 years 5 23-26 years 6 27-30 years 9 31-34 years 2 35-38 years 7 Based on the frequency distribution above, find the relative frequency for the class 15-18 . Relative Frequency = % Give your answer ...
A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally distributed with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast woul ...
Are there more children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural? In the state of Pennsylvania, a fairly urban state, there are 245 eight year ...
Staples has six special drafting pencils for sale, two of which are defective. A student buys two of these six drafting pencils, selected at random. Let the random variable X be the number of defective pencils. Construct ...
Question 1: Find the area between .-88 standard deviations below the mean and 2.35 standard deviations above the mean. '88=.3106 and 2.3=.4906 Both figures are added .3106+.4906= .8012 which is 80.12% Question 2: The are ...
"Jen & Barry's Fast Fresh Salad Bags" starts with $280,000 invested. Jen and Barry pay 20% down and finance the balance with a 20-year small business loan at 4.5% compounded monthly. What is the amount of their monthly l ...
1) Approximately 20% of corporate workforce are not happy with their immediate bosses. Suppose 10 workers working in corporates are randomly selected. a) What is the probability that everybody of them is happy with his i ...
Assume a normal distribution for N = 300. How many cases would one expect to find between +1 and -1 standard deviations around the mean?
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