# Summaries

A specialist teacher observes the time taken by each of the students with learning disabilities to complete a psychological task. She summaries the times using the following:

 Time Taken(mins) 1-5 6-10 11-12 16-20 No. of Student 2 4 12 4

Using the given data, calculate the
(i) mean (3)
(ii) mode (4)
(iii) median (4)
(iv) range (2)
(v) variance (4)
(vi) standard deviation

(1) 5 2130 4 3140 1

μ =  11.2727 min
m =  11.5 min
m2 =  11.5 min
r =  19 min
s =  361.3636
σ =  19.0096

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