Question
Average marks scored by a student in 5 subjects is 75. If
average marks scored by him excluding his highest and lowest marks is 60 and highest marks scored by him is 145, then find the lowest marks scored by him.Solution
Sum of the marks scored by him in 5 subjects = 5 × 75 = 375
Sum of the marks scored by him excluding highest and lowest marks = 3 × 60 = 180
Therefore, sum of his highest and lowest marks = 375 – 180 = 195
Also, highest marks scored by him = 145
Therefore, lowest marks scored by him = 195 – 145 = 50
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