Intervals, Graphs And Charts, Measurements Worksheet With Answers Page 18
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27M1.
(a)
150 - 179
Accept 6th OR sixth (interval).
1
(b)
Explanation that refers to the fact that the ‘middle length call’ is the 46th
in size AND this comes in the middle of the 60 -89 secs. group AND the
middle of the range 60 - 89 is 75, eg
•
“Because 63 of the calls took less than 90 seconds so about 45 took
less than 75 sec.”
1
[2]
M2.
(a)
Yes AND appropriate supporting reason, eg:
•
‘Steve’s jump could have been the largest in the 300–349 category’
•
‘Maybe nobody got more than him in his group’
If the child has not indicated ‘yes’ award one mark, only if the
explanation makes clear why the answer is ‘yes’ or why he
could be correct.
Do not accept a correct explanation if ‘no’ has been clearly
indicated.
Do not accept vague or arbitrary reasons, eg:
‘He might be a good jumper’;
‘It was a good day for him’.
1
(b)
Evidence of awareness that the median is the middle value of
the whole set of results, eg:
•
‘The median is in the 200–249cm group’
•
‘More than half were less than 250’
•
‘The middle is in the 200–249 set’
•
‘More than half of the results are below 275cm’
Do not accept vague or arbitrary reasons, eg:
‘The graph only shows groups’;
‘275 isn’t in the middle group’.
1
[2]
Page 18 of 27
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