Mean, pass rate and cohort estimate from stems

Mean, pass rate and cohort estimate from stems

Secondary 2

TGM Original Questions

Scores are shown.

Stem	Leaf
\(1\)	\(4\) \(8\)
\(2\)	\(2\) \(5\) \(5\) \(7\) \(9\)
\(3\)	\(1\) \(3\) \(6\) \(8\)
\(4\)	\(0\) \(2\) \(4\) \(5\) \(7\)
\(5\)	\(1\) \(4\)

Key: \(1|4=14\).

Find the mean.
The pass mark is 32; find the percentage who passed.
In a cohort of 270, estimate how many score below 25 and need remediation.

Solution:

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Answer:(i) \(34.5\); (ii) \(55.6\%\); (iii) \(45\) students.

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