Q: 146 (IAS/1999)

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In an office, the distribution of work hours is as shown in the following table.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 ?
No. of Staff MembersNo. of hours worked
50 - 19
120 - 24
2525 - 29
4030 - 34
1535 - 39
840 - 45
question_subject: 
Maths
question_year: 
1999
question_exam: 
IAS
question_sub_subject: 
Mathematics
question_topic: 
Mathematics
stats: 
0,56,112,40,48,56,24