Let be the average age of 25 doctors where is the age of a randomly selected doctor. If is normally distributed then so is .
will be distributed as follows: (mean, variance)
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The average age of doctors in a certain hospital is 43.0 years old. Suppose the distribution of ages is normal and has a standard deviation of 8.0 years. If 25 doctors are chosen at random for a committee, find the probability that the average age of those doctors is less than 43.8 years. Assume that the variable is normally distributed.
Let be the average age of 25 doctors where is the age of a randomly selected doctor. If is normally distributed then so is .
will be distributed as follows: (mean, variance)