A student average arithmetic mean test score on 4 tests is 78.what must be the students score on 5th test for the students average score on the 5th test
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Mean = (sum of marks)÷(no of test)
Let the sum of marks be x,
78 = x÷4
x = 78×4
x = 312
Now let us assume that the student got y marks in the fifth test.
So
Mean = (312+y)÷5
78 = (312+y)÷5
312+y = 78×5
312+y = 390
y = 390-312
y= 78 ans.
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Answer:
78
Step-by-step explanation:
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