Question

a girl took nine test in different subjects and had average of 60%. if in her tenth test she obtained 85%, find her new average​

Answer 1

62.5%

Explanation:

average = sum of scores / number of scores

60% = [sum of 9 tests] / 9

[new average] = [sum of 10 tests] / 10

= ([sum of 9 tests] + 85%) / 10

= ((9 * 60%) + 85%) / 10

= 62.5%