On a test, the marks for ten students are: 2 students, 85%; 4 students, 78%; 3 students, 66%; and 1 student, 92%. What is the average

Question

On a test, the marks for ten students are: 2 students, 85%; 4 students, 78%; 3
students, 66%; and 1 student, 92%. What is the average mark on the test? (Exact
Answer)

in progress 0
Calantha 4 years 2021-08-24T14:15:07+00:00 1 Answers 6 views 0

Answers ( )

  1. Edana
    0
    2021-08-24T14:17:03+00:00
    Reply

    Answer:

    77.2%

    Step-by-step explanation:

    The average formula is:

    Average = \frac{Sum/of/all/numbers}{How/many/numbers/there/are}

    Let’s first find the sum of all the numbers (remember sum means to add):

    (2)(85) + (4)(78) + (3)(66) + 92 = ?

    170 + 312 + 198 + 92 = 772

    There are marks for 10 students so that is what goes at the bottom (10 students, 10 test scores)

    Plug both things into the equation:

    Average = \frac{772}{10} \\= 77.2

    Therefore, the average mark on the test was 77.2%

    Hope this helps!!

    – Kay 🙂

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )