Question

Jethro has sat 5 tests. Each test was marked out of 100 and Jethro’s mean mark for the 5 tests is 74 Jethro has to sit one more test that is also to be marked out of 100 Jethro wants his mean mark for all 6 tests to be at least 77 Work out the least mark that Jethro needs to get for the last test.

Answer 1

Given :- Jethro has sat 5 tests. Each test was marked out of 100 and Jethro’s mean mark for the 5 tests is 74 Jethro has to sit one more test that is also to be marked out of 100 Jethro wants his mean mark for all 6 tests to be at least 77 Work out the least mark that Jethro needs to get for the last test. ?

Answer :-

Let us assume that, In last test john score was x marks.

so,

→ Mean of first 5 test = 74

then,

→ Total marks of 5 test = 74 * 5 = 370 marks .

now,

→ Total marks of 6 test = (370 + x) marks..

then,

→ Mean = (Total marks) / (Total test)

→ (370 + x) / 6 = 77

→ 370 + x = 462

→ x = 462 - 370

→ x = 92 marks (Ans.)

Hence, John should score at least 92 marks , so that his mean is at least 77 .

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