Diane's Tree Trimming Service has trimmed hundreds of trees in the Greater Denver area. The time it takes to trim a tree is normally distributed with a mean of 32 minutes and a standard deviation of 5 minutes (Use this distribution to answer the next several questions). What percent of trees get trimmed between 28.5 and 31.5 minutes? Group of answer choices 21.82% 75.80% 70.22% 29.78%

And we can find this probability with this difference:

And in order to find these probabilities we use tables for the normal standard distribution, excel or a calculator.

So then the best answer would be 21.82 %

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the time it takes to trim a tree of a population, and for this case we know the distribution for X is given by:

Where and

We are interested on this probability

And the best way to solve this problem is using the normal standard distribution and the z score given by:

If we apply this formula to our probability we got this:And we can find this probability with this difference:

And in order to find these probabilities we use tables for the normal standard distribution, excel or a calculator.

 So then the best answer would be 21.82 %

answer: about 22.67

step-by-step explanation: