Question

(
$|?| + |?| = 8 \\ + \: \: \: \: \: \: \: + \\ |?| - |?| = 6 \\ = \: \: \: \: \: \: \: = \\ 13 \: \: \: \: \: \: \: 8$
Solve it​

Answer 1

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Answer 2

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 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