4.1f-4.1g To identify averages and spread (range) from grouped/ungrouped frequency tables.

Question 1

watch the video 4.1f

Work out the mean for each of these frequency tables. You may not use a calculator (look on corbet maths)
only a and b

grouped

Answer 1

a) 6.5
b)2.3

Question 2

ungrouped

A teacher asked his class how long they spent revising for a test, to the nearest hour. By calculating the mean, compare the amount of time the boys and girls spent revising.
(look on corbet maths)

Answer 2

16.475

Question 3

look on corbet

Calculate an estimate of the median for each of the following (only a and b)

watch video

Answer 3

(a)25 cm
(b)65 seconds

Question 4

For each data set above, calculate:
(a) the lower quartile
(b) the upper quartile
(c) the interquartile range

Answer 4

look on corbet

Question 5

question 1 apply

(a) Calculate an estimate of the mean salary
(b) Calculate an estimate of the median salary

lookon corbet for chart

Answer 5

(a) £23541.67
(b) £20800

Question 6

Work out an estimate of the mean for each of these frequency tables. (a and b)

Answer 6

a) 17
b)11.76