Combined mean

25 students in class A did a science exam.

30 students in class B did the same science exam.

The mean mark for the 25 students in class A is 67.8

The mean mark for all the 55 students is 72.0

Work out the mean mark for the students in class B.

• 72.0

• 67.9

• 1695

• 75.5

There are 12 students in Phil’s Maths group. The mean mark in a test is 76%. In Paul’s

group there are only eight students. Their mean mark is 84%.

Find the overall mean for the 20 children.

• 79.2

• 67.6

• 57.9

• 79.1

Pete has seven Shetland ponies. They have a mean height of 116cm.

Pete buys an eighth pony. The height of this pony is 128cm.

Find the mean height of all eight ponies.

• 123cm

• 135cm

• 117.25cm

• 117.5cm

The mean height of seven pupils is 123cm. One pupil of height 147cm leaves the group.

Find the mean height of the remaining six pupils

• 121cm

• 119cm

• 118cm

• 127cm

Annabel recorded her test results in the back of her exercise book.

Maths English Physics Chemistry Biology

88% 85% 77% 79% ????

Annabel knows the mean of her five tests was 81%.

What did she get in Biology?

• 76%

• 81%

• 68.5%

• 76.5%