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प्रश्न
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 ______.
पर्याय
increased by 1
increased by 1.5
decreased by 1
decreased by 1.5
उत्तर
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 decreased by 1.5.
Explanation:
Average score = `"Sum of scores in all exams"/"Total number of exams"`
∴ Average score in first three examinations
= `(97 + 73 + 88)/3`
= `258/3`
= 86
Also, average score in four three examinations
= `(97 + 73 + 88 + 80)/4`
= `338/4`
= 84.5
Hence, average score is decreased by (86 – 84.5) = 1.5
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