Standard Deviation Formula

Which of the following is a formula that describes calculating a z-score?

• Z = (score - mean) / stand. devation

• Z = (mean - score) / stand. dev.

• Z = score/stand. dev/ mean

• Z = dragonball

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Find the z-score.

Mean = 38

Standard Deviation: 1.2

x = 42

• 3.33

• -3

• 3.03

• -3.33

What is the standard deviation of these numbers?

Mathematical Equivalence

ON

Find the standard deviation of the pulse rates. Use two decimal places in your answer.

Mathematical Equivalence

ON

What is the standard deviation for the data given:

{12, 13, 29, 18, 61, 35, 21}

Round to the hundredths place.

Mathematical Equivalence

ON

A random sample of 10 Maryville high school students reveals data about their sleep in hours per school night:
4.5, 5, 8, 8.5, 7, 6, 6.5
Determine the standard deviation and round to one decimal place.

Mathematical Equivalence

ON

Find the z-score.

Mean = 45

Standard Deviation: 2.1

x = 50

• 2.38

• 3.00

• 3.08

• 2.33

Find the z-score.

Mean = 40

Standard Deviation: 1.4

x = 42

• 1.43

• 1.28

• -1.4

• 1.24

Find the z-score.

Mean = 25

Standard Deviation: 7

x = 9.6

• -2.2

• -36

• 5.2

• 23.46