The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 254.2 and a standard deviation of 68.9. (All units are 1000 cells/uL) Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of women with platelet counts within 2 standard deviations of the mean, or between 116.4 and 392.0? b. What is the approximate percentage of women with platelet counts between 185.3 and 323.1? a. Approximately % of women in this group have platelet counts within 2 standard deviations of the mean, or between 116.4 and 392.0. (Type an integer or a decimal. Do not round.) b. Approximately % of women in this group have platelet counts between 185.3 and 323.1. (Type an integer or a decimal. Do not round.)

Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed with mean, u = 109 mmHg and standard deviation , o = 13 mmHg. According to Chebyshev's Theorem, at least what percentage of the islander's have blood pressure in the range from 85.6 mmHg to 132.4 mmHg ? answer:

Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 44 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that ? = 7.50 ml/kg for the distribution of blood plasma. When finding an 99% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.) zc =  (a) Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error

The average score on a statistics test was 2.36 with a standard deviation of 0.69. The professor suspects that the test was very difficult; accordingly, he wishes to adjust the scores so that the mean is 3.97 and the standard deviation is 0.25. Calculate the a and b values so that the aX+b type adjustment gives the desired mean and variance? Calculate: a=  b=