Mathematics
Directions:
Study the following table carefully and answer the questions that follow:
| Age (in years) | Number of employees (Frequency) | Cumulative frequency |
|---|---|---|
| 30 - 35 | 5 | 5 |
| 35 - 40 | 7 | 12 |
| 40 - 45 | 6 | 18 |
| 45 - 50 | 9 | 27 |
| 50 - 55 | 4 | 31 |
Based on above table, answer the following questions:
- The total number of employees is :
(a) 30
(b) 31
(c) 55
(d) Cannot be determined
- How many employees are less than 50 years of age?
(a) 9
(b) 18
(c) 27
(d) 31
- How many employees are atleast 40 years old?
(a) 12
(b) 18
(c) 19
(d) 27
- What is the difference between the class-mark of the first and last class intervals?
(a) 20
(b) 22.5
(c) 25
(d) 27.5
Related Questions
If the lower limit of a class-interval is 48 and the class-mark is 55, then the upper limit is :
60
62
64
61
If the class-intervals in a frequency distribution are 1 - 11, 11 - 21, 21 - 31, etc., then class 1 - 11 means :
more than 1 and less than 11
1 or more but less than 11
equal to or more than 1 but equal to or less than 11
more than 1 but less than or equal to 11
Assertion (A) : For constructing frequency polygon, class-marks should be calculated.
Reason (R) : To construct a frequency polygon, we take class marks along x-axis and corresponding frequencies along y-axis.
A is true, R is the false
A is false, R is true
Both A and R are true
Both A and R are false.