Question

Nisha secured 73,86, 78 and 75 marks in four tests what is the least number of marks we can secure in her next test if she has to have a mean score of 80 marks in five test.

Answer 1

Answer:88

Step-by-step explanation: Let the least number of marks be X,

then we have:

Mean = (73 + 86 + 75 + 78 +X)/5

80 = (73+86+75+78+X)/5

80*5 = 312+X

400 = 312+X

X = 400-312

X = 88