
Combined mean
Authored by I L
Mathematics
9th Grade
Used 19+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
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
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
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
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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%
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