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Percentage of a normal distribution

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1. A simple random sample of 40 adults Is obtained and each person's red blood cell count is measured (in microliters). The sample mean is 4.05. The population standard deviation for red blood cell counts is .40. Construct a 95% confidence interval estimate of the mean red blood cell count of adults.

2. What percentage of a normal distribution is within 2 standard deviations of the mean? (Select the closest answer.)

a. 50%

b. 95%

c. 75%

d. 100%

3. The area under the standard normal distribution between -1.35 and 2.0 is

a. 0.3887

b. -.0658

c. 0.4332

d. .8887

4. A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 32 years, with a sample standard deviation of 7 years.

a. Find a 95% confidence interval for the population mean age.

5. A simple random sample of 125 SAT scores has a mean of 1500. Assume that SAT scores have a standard deviation of 250. Construct a 99% confidence interval estimate of the mean SAT score.

Reference no: EM131555228

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