Question

34,33,36,34,37,33,35,36,35,34,36,37,33,
34,35,33,33,34,37,33,35,37,34,33,34

1. construct a frequency distribution representing the above data




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Answer 1

Answer:

Weight in kg No. of students

30−35 3

35−40 5

40−45 3

45−50 5

50−55 2

55−60 1

60−65 1

a−b⇒a<W≤b

W→ weight.

Answer 2

Page No 107:

Question 1:

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.

(c) What is the range of he given distribution?

ANSWER:

The frequency distribution table for the given marks can be drawn as:

(i) The class interval (40−49) has the highest frequency and the class interval (90−99) has the lowest frequency.

(ii) In the class interval (30−39), the lower limit is 30 − 0.5 = 29.5 and the upper limit is

39 + 0.5 = 39.5.

(iii) The range of the given distribution is 97− 32 = 65.