The red blood cell counts (in millions 01 cells per microliter} tor a population of adult males can be approximated by a normal distribution, with a mean of 5.3 million cells per microliter and a standard deviation of 0.4 million cells per microliter. (a) What is the minimum red blood cell count that can be in the top 20% of counts? (b) What is the maximum red blood cell count that can be in the bottom 12% of counts? <: minimum red blood cell count is d million cells per microliter. to two decimal places as needed. maximum the mean height of women in a country inches. random sample oi this age group selected. what probability that for greater than inches assume o="2.87." four recent study on world happiness participants were asked evaluate their current lives scale from i where represents worst possible life and best lite. responses normally distributed with standard deviation answer parts below.> (a) Find the probability that a randomly selected study participant's response was less than 4. The probability that a randomly selected study participant's response was less than 4 is D. [Round to four decimal places as needed.) (b) Find the probability that a randomly selected study participant's response was between 4 and B. The probability that a randomly selected study participant's response was between 4 and B is |:. (Round to tour decimal places as needed.) {c} Find the probability that a randomly selected study participant's response was more than 8. The probability that a randomly selected study participant's response was more than B is D. {Round to tour decimal places as needed.) (d) Identify any unusual events. Explain your reasoning. Choose the correct answer below. 0 A. There are no unusual events because all the probabilities are greater than 0115. O B. The event in part {a} is unusual because its probability is less than [1.05. O C. The events in parts {a}, (b). and {c} are unusual because all of their probabilities are less than 0.05. O D. The events in parts {a} and (c) are unusual because their probabilities are less than 0.05. Determine the minimum sample size required when you want to be 99% confident that the sample mean is within one unit of the population mean and o = 19.2. Assume the population is normally distributed. A 99% confidence level requires a sample size of 2454 (Round up to the nearest whole number as needed.)