Question

Help me please, please

Answer 1

Answer:

67

13

(12)

We know that Mean = sum of numbers/count of numbers

Sum of scores of 20 students/20 = 65

Sum of scores of 20 students = 1300

Now two scores are added to sum.

Now, Sum of scores of 22 students = 1300 + 85 +89 = 1474

Now new mean = 1474/22 = 67

(13)

Mean = x+5+7+8+12+6+10+11/8 = 9

x+59/8 = 9

x+59 = 72

x = 13