UPSC CSE Prelims 1999 Q146 — Science & Technology PYQ with Answer

In an office, the distribution of work hours is as shown in the following table:

No. of Staff Members | No. of hours worked

5 | 0 – 19

12 | 20 – 24

25 | 25 – 29

40 | 30 – 34

15 | 35 – 39

8 | 40 – 45

Consider the following inferences drawn from the table:

I. The average number of hours worked by a staff member is about 30.

II. The percentage of those who worked 35 or more hours is less than 25.

III. At least 5 staff members worked more than 44 hours.

Which of these inferences is/are valid?