Not sure but I believe letter B) 3+4 is rational since the answer is 7 and 7 is a rational number and it can be expressed as a quotient. The sum of a rational number and an irrational number is irrational. The sum of two rational numbers is rational

8 0

3 years ago

A cell phone company says that a fully charged battery lasts 14 hours. In reality, each battery behaves a little differently. Fo

gregori [183]

Answer:

The percentage is 50%

Step-by-step explanation:

From the question we are told that

The mean is $\mu = 14 \ hours$

The standard deviation is $\sigma = 1 \ hour$

Generally on the normal distribution curve the mean divides the curve into two. with the half to the left of the mean (50% to the left )representing the percentage of the batteries that will last less than 14 hours and the area under the curve to the right (50% to the right)representing the percentage of batteries that will last longer than mean (14 hours )

Hence the percentage of the cell phone batteries that will be expected to last longer than 14 hours is 50%

8 0

4 years ago