# Walden University Wk 3 Standard Deviation Units Exercises

Submit your responses to the following prompts.

A market-research firm was hired to determine the percentage of people in a market area who would purchase a clientâ€™s magazine if a door-to-door sales campaign were undertaken. The firm stated that 40% would buy if contacted at home. Suppose the marketing company has tried the sales campaign at 300 randomly selected homes. (150â€“225 words, or 2â€“3 paragraphs)

Assuming the market research was done properly and the 40% is representative, how many sales are expected if the publisher attempts to sell to 5,000 homes?

If the market research was accurate, what is the probability that fewer than 100 individuals will buy? Use the normal approximation to the binomial.

Suppose that the publisher actually sells the magazine to 70 people out of the 300 contacted. What would you conclude about the market research? About the campaign?

A steel mill produces alloy sheets used for the bodies of automobiles. The mill produces sheets with an average thickness of 0.517 inches and a standard deviation of 0.037 inches. A new car model requires alloy sheets between 0.495 and 0.525 inches thick. What percentage of the sheets made by the mill will be suitable for the new car model? Explain your answer. (75 words, or 1 paragraph)

The VP of HR for a large company is interested in the distribution of sick-leave hours for employees at the company. A recent study revealed that the distribution was consistent with a normal model, with a mean of 58 hours per year, and a standard deviation of 14 hours. An office manager of one division believes that during the past year, two of the divisionâ€™s employees have taken excessive sick leave. One took 74 hours and the other used 90 hours. What would you conclude about the division managerâ€™s claim, and why? (75 words, or 1 paragraph)

Each month, an American household generates an average of 28 pounds of newspaper for garbage and/or recycling. Assume this is approximately normally distributed and that the standard deviation is 2 pounds. If a household is selected at random, find the probability of it generating between 27â€“31 pounds per month. (75 words, or 1 paragraph)

Note: For each prompt, be sure to reference at least one scholarly source to support your answer. Use the Walden Undergraduate Paper Template, provided in this weekâ€™s Learning Resources, to complete this Assignment.

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