Ask Question
30 May, 11:21

Amber's mean mark on five tests is 80.

Her marks on four of these tests are 68, 81, 74 and 89.

Work out her mark on the fifth test.

+5
Answers (2)
  1. 30 May, 12:51
    0
    The answer is 88.

    Step-by-step explanation:

    68+81+74+89+x/5=80

    312+x/5=80

    312+x=80*5

    312+x=400

    x=400-312

    x=88
  2. 30 May, 14:30
    0
    88

    Step-by-step explanation:

    The mean is the total sum of all the marks divided by how many there are.

    68+81+74+89=312 Total of 4 tests

    80*5 = 400 Total marks on 5 tests

    400-312 = 88 Total marks on 5 tests - Total marks on 4 tests = 1 test

    68+81+74+89+88 = 400
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Amber's mean mark on five tests is 80. Her marks on four of these tests are 68, 81, 74 and 89. Work out her mark on the fifth test. ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers