of 5-7, 6-6, 7-2, 9.3, 6-2.
1
The marks obtained by 15 students in a class test are 12, 14, 07, 09, 23, 11, 08, 13, 1),
19, 16, 24, 17, 03, 20. Find :
(0) the mean of their marks.
(ii) the mean of their marks when the marks of each student are increased by 4.
(111) the mean of their marks when 2 marks are deducted from the marks of each
in the mean of their marks when the marks
student.
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Answer:
The obtained marks by 15 students arranging in ascending order,
03,07,08,09,11,11,12,13,14,16,17,19,20,23,24
(i) Mean=
15
03+07+08+09+11+11+12+13+14+16+17+19+20+23+24
=
15
207
=13.8
(ii) The obtained marks by 15 students arranging in ascending order,
03,07,08,09,11,11,12,13,14,16,17,19,20,23,24
(i) Mean=
15
03+07+08+09+11+11+12+13+14+16+17+19+20+23+24
=
15
207
=13.8
(ii) The new marks after increasing each student mark by 4 are,
07,11,12,13,15,15,16,17,18,20,21,23,24,27,28
Mean=
15
07+11+12+13+15+15+16+17+18+20+21+23+24+27+28
=
15
267
=17.8
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