Question

Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees. 0° and standard deviation of 1.00 °C. A thermometer is randomly selected and tested. Draw a sketch and find the temperature reading corresponding to Upper P 91. P91​, the 91 st percentile. This is the temperature reading separating the bottom 91 % from the top 9 %.

A. graph representing the Upper P 91

B. The temperature for Upper P 91

P91 is approximately ________°.

​(Round to two decimal places as​ needed.)

Answer 1

Let's use excel to draw a graph.

Click on Graph >>> Probability Distribution Plot...>>>Select forth graph >>>OK

Look the following image:

So we get the following window:

Fill the required information:

Look the following image:

Then click on OK so we get the following image:

Select the required options and graph like above image and then click on OK.

So we get the following output:

The above graph is the required graph

and the required temperature is 1.34 ^oC .