To find the missing number d, we can use the formula for finding the mean of a set of numbers. The mean is the sum of all the numbers divided by the total number of numbers.
Given data:
82, 89, 85, 84, d, 82, 84
Mean = 84
Sum of the numbers = 82 + 89 + 85 + 84 + d + 82 + 84
= 506 + d
Total number of numbers = 7
Mean = Sum of the numbers / Total number of numbers
84 = (506 + d) / 7
84 * 7 = 506 + d
588 = 506 + d
d = 588 - 506
d = 82
Therefore, the missing number d in the given data must be 82.
Trudy has the following data
82
89
85
84
d
82
84
If the mean is 84 which number could d be
82 or 61
1 answer
1 answer