Question 29

Tally marks are used to find
(a) class intervals
(b) range
(c) frequency
(d) upper limit

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Solution

(c) Tally marks are used to find the frequency of the observations.

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Question 29

Tally marks are used to find
(a) class intervals
(b) range
(c) frequency
(d) upper limit

Q. Mark the correct alternative in each of the following:
Tally marks are used to find

(a) class intervals

(b) range

(c) frequency

(d) upper limits

The marks scored by 40 candidates in an examination (out of 100) is given below:

75, 65, 57, 50, 32, 54, 75, 67, 75, 88, 80, 42, 40, 41, 34, 78, 43, 61,

42, 46, 68, 52, 43, 49, 59, 49, 67, 34, 33, 87, 97, 47, 46, 54, 48, 45,

51, 47, 41, 43.

Prepare a frequency distribution table with the class size 10. Take the class intervals as (30 - 39), (40 - 49), … and answer the following question:

(a) Which class intervals have highest and lowest frequency?

(b) Write the upper and lower limits of the class interval 30-39.

(i) Find the class mark of the class 90-120.
(ii) In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lower limit of the class.
(iii) The width of each of five continuous classes in a frequency distribution is 5 and lower class limit of the lowest class is 10. What is the upper class limit of the highest class?
(iv) The class marks of a frequency distribution are 15, 20, 25, .... Find the class corresponding to the class mark 20.
(v) In the class intervals 10-20, 20-30, find the class in which 20 is included.

Q. For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively
(a) upper limits of the classes
(b) lower limits of the classes
(c) class marks of the classes
(d) upper limits of preceding classes

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Question 29 Tally marks are used to find (a) class intervals (b) range (c) frequency (d) upper limit

(c) Tally marks are used to find the frequency of the observations.

Question 29

Tally marks are used to find
(a) class intervals
(b) range
(c) frequency
(d) upper limit