In a certain population of fish, the lengths of the individual fish follow approximately a normal distribution

Question:

In a certain population of fish, the lengths of the individual fish follow approximately a normal with mean 54.0 mm and standard deviation 4.5 mm. 'e saw in Example 4.3.1 that in this situation, 65.68% of e fish are between 51 and 60 mm long. Suppose a random sample of four fish is chosen from the population, d the probability that
(a) All four fish are between 51 and 60 mm long.
(b) The mean length of the four fish is between 51 and 60 mm.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...