Social Networking

Question 1

What is X in terms of finding the mean

Answer 1

X is the variable

Question 2

What is x̅ in terms of finding the mean

Answer 2

x̅ is the mean

Question 3

What is ƒ in terms of finding the mean

Answer 3

ƒ is the frequency of a set of data

Question 4

What is ∑ in terms of finding the mean

Answer 4

∑ is the sum of values

Question 5

Find x̅ when:
ƒx = 5+20+6
ƒ = 5+10+2

Using the formula x̅ = ∑ƒx / ∑ƒ

Answer 5

x̅ = ∑ƒx / ∑ƒ = 5+20+6 / 5+10+2 = 31 / 17 = 1.82 (to 2 d.p)

Question 6

How do you calculate the median

Answer 6

Median = nth value ÷ 2

Question 7

How do you calculate the LQ

Answer 7

LQ = nth value ÷ 4

Question 8

How do you calculate the UQ

Answer 8

UQ = 3nth value ÷ 4

Question 9

What does the variance measure?

Answer 9

The variance measures how spread out a set of data is

Question 10

What does the standard deviation measure?

Answer 10

The standard deviation of a set of data is a measure of how far the values vary from the mean

Question 11

What formula is this?
√∑(x-x̅)^2
/2

Answer 11

Standard deviation