11. Khilona earned scores of 97,73 and 88 respectively in her first three examinations. If she scored 80 in the
fourth examination, then her average score will be
(a) increased by 1 (b) increased by 1.5 (c) decreased by 1 (d) decreased by 1.5
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Answer:
(d) decreased by 1.5
Step-by-step explanation:
Score 1 = 97
Score 2 = 73
Score 3 = 88
Average of first three scores = 97+73+88÷3
= 258÷3
= 86
Score 4 = 80
Average of all scores = 97+73+88+80 ÷4
=338÷4
=84.5
Difference = 86-84.5
=1.5
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