The class-mark of a class interval is 42. If the class-size is 10, then the upper and lower limits of the class are
47 and 37
47.5 and 37.5
46.5 and 36.5
46 and 36
Statistics
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Question

The class-mark of a class interval is 42. If the class-size is 10, then the upper and lower limits of the class are 1. 47 and 37 2. 47.5 and 37.5 3. 46.5 and 36.5 4. 46 and 36

KnowledgeBoat · Accepted Answer

Given, Class size = 10 Class mark = 42 Let upper limit be U and lower limit be L. As we know, Class mark = Class size = Upper limit - Lower limit = U - L ⇒ 10 = U - L ....(2) Adding eq.(1) and (2), we have : ⇒ 84 + 10 = 2U ⇒ 2U = 94 ⇒ U = ⇒ U = 47. Substituting value of U in eq. (1), we have : ⇒ L + U = 84 ⇒ L + 47 = 84 ⇒ L = 84 - 47 ⇒ L = 37. Hence option 1 is the correct option.

x	Frequency	Cumulative frequency
1	6	6
2	13	a
3	b	27
4	5	c
5	11	d
6	e	50

Mathematics

The class-mark of a class interval is 42. If the class-size is 10, then the upper and lower limits of the class are
47 and 37
47.5 and 37.5
46.5 and 36.5
46 and 36

Statistics

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b = 8, d = 43, e = 7
a = 19, c = 31, e = 17
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Mathematics

The class-mark of a class interval is 42. If the class-size is 10, then the upper and lower limits of the class are47 and 3747.5 and 37.546.5 and 36.546 and 36

Statistics

Related Questions

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The class-mark of a class interval is 42. If the class-size is 10, then the upper and lower limits of the class are
47 and 37
47.5 and 37.5
46.5 and 36.5
46 and 36

Consider the following frequency distribution.
x Frequency Cumulative frequency
1 6 6
2 13 a
3 b 27
4 5 c
5 11 d
6 e 50
Which of the following combination is correct?
a = 13, c = 32, e = 9
b = 8, d = 43, e = 7
a = 19, c = 31, e = 17
b = 9, d = 38, a = 19

Consider the following statements:
(i) The classes of type 15 - 19, 20 - 24, 25 - 29 etc. are exclusive classes.
(ii) The classes of type 15 - 20, 20 - 25, 25 - 30 etc. are inclusive classes
Which of the above statements is/are correct?
(i) only
(ii) only
Both (i) and (ii)
Neither (i) nor (ii)

The following marks were obtained by the students in a test :
81, 72, 90, 90, 86, 85, 92, 70, 71, 83, 89, 95, 85, 79, 62.
The range of marks is :
9
17
27
33

The width of each of nine classes in a frequency distribution is 2.5 and the lower class boundary of the lowest class is 10.6. Which of the following is the upper class boundary of the highest class?
28.1
30.6
33.1
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