averages

Question 1

what does the mean tell us?

Answer 1

the average

Question 2

how do we work out the mean?

Answer 2

add all the numbers and divide by the number of values

Question 3

what does the range tell us?

Answer 3

how spread out the data is

Question 4

how do we work out the range?

Answer 4

highest value - lowest value

Question 5

what is the mode?

Answer 5

the most occurrent number

Question 6

how do we work out the median?

Answer 6

∑f+1

2

Question 7

how do we work out the upper quartile?

Answer 7

3 (∑f+1)

4

Question 8

how do we work out the lower quartile?

Answer 8

∑f+1

4

Question 9

how do we work out the interquartile range?

Answer 9

upper quartile - lower quartile

Question 10

what do frequency tables show us?

Answer 10

how often an event is occurring

Question 11

which averages do you use when comparing sets of data presented as box plots?

Answer 11

median and interquartile range

Question 12

how do you find the mean of a frequency table?

Answer 12

∑fx

∑f

Question 13

how do you find the mean of a grouped frequency table?

Answer 13

∑f x mp

∑f