The ages of a group of 158 randomly selected adult females have a standard deviation of 16.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let o = 16.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 99% confidence that the sample mean is within one-half year of the population mean. The required sample size is (Type a whole number.)

At a large university, data were collected on the number of sisters and brothers that each student had. Let therandom variable X represent the number of sisters and the random variable Y represent the number ofbrothers. The distribution of X has mean 1.00 and standard deviation 0.94. The distribution of Y has mean1.07 and standard deviation 1.04. What is the mean of the distribution of  X+Y? WHAT IS THE CORRECT ANSWER   A. 1.98 B. 2.01 C. 2.04 D. 2.0528 E. 2.07

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Suppose that the daily intake of an adult follows a uniform distribution from 40 to 65 micrograms. Suppose that 36 adults are randomly selected. What is the mean and standard deviation of the average intake for 36 adults. a. Mean= 52.5 stvdev = 1.2 b. Mean = 55 stvdev= 7.22c. Mean = 52.5 stvdev = 2.08 d. Mean= 52.5 stvdev = 7.22