The fish population in a certain lake rises and falls according to the formula F = 4000(25 + 17t- t^2).
Here F is the number of fish at time t, where t is measured in years since January 1, 2003, when the fish population was first estimated.
(a) on what date will the fish population again be the same as it was on January 1, 2003?
June 1
(b) By what date will all the fish in the lake have died?
--Select-

The variance of the temperatures of the 10 day period must be at least zero.

Step-by-step explanation:

The variance is the expectation of the squared deviation of a random variable from its mean. It measures how far a set of numbers are spread out from their average value.

Its unit of measure corresponding to the square of the unit of measure of the variable. In this case, the variance of the temperatures is expressed in (°C)². The variance has a minimum value of 0.

Since the variance is squared, it will always have values greater than zero.