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Option 3 : 60
Given:
Average presence of students on Monday, Tuesday and Wednesday = 32
Average presence of students on Wednesday, Thursday, Friday and Saturday = 30
Average presence of students of all six days = 26
Formula:
Average = Sum of all observation/Total number of all observation
Calculation:
Sum of the presence of students on Monday, Tuesday and Wednesday = 3 × 32 = 96
Sum of the presence of students on Wednesday, Thursday, Friday and Saturday = 4 × 30
= 120
Sum of the presence of students of all six days is = 6 × 26 = 156
∴ Presence of students on Wednesday = (96 + 120) – 156 = 60
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