Thirty-eight percent of all shoppers at a large department store are holders of the store's charge card. If a random sample of 100 shoppers is taken, what is the probability that at least 30 of them will be found to be holders of the card?
Answer to relevant QuestionsWhen sampling is from a normal population with an unknown variance, is the sampling distribution of the sample mean normal? Explain. A new kind of alkaline battery is believed to last an average of 25 hours of continuous use (in a given kind of flashlight). Assume that the population standard deviation is 2 hours. If a random sample of 100 batteries is ...Find five random numbers from 0 to 5,600. "Small-fry" funds trade at an average of 20% discount to net asset value. If σ = 8% and n = 36, give the 95% confidence interval for average population percentage. An executive placement service needs to estimate the average salary of executives placed in a given industry. A random sample of 40 executives gives x-bar = $42,539 and s = $11,690. Give a 90% confidence interval for the ...
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