Question

An employee records the number of prescriptions filled at a pharmacy each hour during an 8-hour period. The table shows the results.

The employee spilled coffee on the table, making the entry for hour 2 unreadable. The employee knows that the mean for the data in the table is 21. How many prescriptions were filled during hour 2?
A.13
A.
13
B.14
B.
14
C.20
C.
20
D.22
D.
22

Answer 1

the number of prescriptions filled during hour 2 is 13

Explanation:

The computation of the number of prescriptions filled during hour 2 is as followS;

Given that

Mean = 21

Total number of hour is 8

Now we assume the prescription filled be x

so

Mean = Sum of all prescriptions ÷ total number of hours

21 = (18 +x + 22 + 25 + 16 + 24 + 22 + 28) ÷ (8)

21 = (155 + x) ÷ 8

Now multiplied it by 8 in both sides

21 × 8 = (155 + x) ÷ 8 × 8

168 = 155 + x

x = 13

hence, the number of prescriptions filled during hour 2 is 13