New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Data Handling Self Practice 15A Solution
(1) Her mean score
= (80+85+90+71+60+100)/6
= 81
(2) His mean score =
(138+144+155+142+167+172)/6
= 153
(3)
(a) 1st 5 natural no – 1, 2, 3, 4, 5
Mean = (1+2+3+4+5)/5
= 15/5
=3
(b) 1st 7 whole no – 0, 1, 2, 3, 4, 5, 6
Mean = (0+1+2+3+4+5+6)/7
= 21/7
= 3
Or, 312 + X = 80x 5
Or, 312 + X = 400
Or, X = 400 – 312
Or, X = 88
Ans: – She should secure 88 marks in her next test.
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