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3. (a) The marks obtained by some candidates in an examination are
(i)
(ii)
28 35 41 47 62
70 81
59 60 61 62 70 80 68
67 68 69 70 78 57 66
74 76 77 78 54 64 73
90 94 51 64 72 83
88 90
Construct a grouped frequency table for the distribution using the intervals 20 - 29
39, 40-49 etc
What is the probability that a candidate chosen at random had 50 to 69 marks?



Answer :

Answer:

1/3

Step-by-step explanation:

Interval Frequency

20-29 2

30-39 1

40-49 4

50-59 2

60-69 8

70-79 7

80-89 3

90-99 3

Now, we can calculate the probability of a candidate chosen at random having 50 to 69 marks:

Frequency of having 50-69: 10

Total frequencies: 30

10/30=1/3

1/3 is the probability that a candidate chosen at random had 50-69 marks.

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