A researcher collected data on the speed of vehicles traveling through a construction zone on a state highway, where the posted speed limit was 25mph. The recorded speed of 20 randomly selected vehicles is given below: 20382439274028372935303132193318342 13623 Calculate the sample mean, standard deviation, and the median of the above data. (Round to one decimal place

Step-by-step explanation:

Given

Solving (a): The sample mean

This is calculated as:

Solving (b): The standard deviation

This is calculated as;

So, we have:

Solving (c): The median

First, sort the data in ascending order

The position of the median is calculated as:

The 10.5th item represents the mean of the 10th and 11th item.

So, median is:

use formula for the circle a=3.14

step-by-step explanation: