Six different​ second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings​ (in mmHg) are listed below. Find the​ range, variance, and standard deviation for the given sample data. If the​ subject's blood pressure remains constant and the medical students correctly apply the same measurement​ technique, what should be the value of the standard​ deviation?

The standard deviation will remain unchanged.

Step-by-step explanation:

Given

Solving (a): The range

This is calculated as:

Where:

So:

Solving (b): The variance

First, we calculate the mean

The variance is calculated as:

So, we have:

Solving (c): The standard deviation

This is calculated as:

--- approximately

Solving (d): With the stated condition, the standard deviation will remain unchanged.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

addition

step-by-step explanation: