a vat of milk has spilled on a tile floor. the milk flow can be expressed with the function r(t) = 4t, where t represents time in minutes and r represents how far the milk is spreading.
the spilled milk is creating a circular pattern on the tile. the area of the pattern can be expressed as a(r) = πr2.

part a: find the area of the circle of spilled milk as a function of time, or a[r(t)]. show your work.
part b: how large is the area of spilled milk after 4 minutes? you may use 3.14 to approximate π in this problem.

hi guys, im super confused & would seriously love some

The standard deviation of the random variable X is 1.23.

Step-by-step explanation:

For each Connecticut resident, there are only two possible outcomes. Either they have Type B blood, or they do not. The probability of a resident having type B blood is independent of other residents. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The standard deviation of the binomial distribution is:

9.2% of all Connecticut residents have Type B blood.

This means that

A random sample of 18 Connecticut residents is taken.

This means that

What is the standard deviation of the random variable X?

The standard deviation of the random variable X is 1.23.