the pattern used to construct sentences in past perfect tense and past tense
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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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