Question

Solve it (50points)
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Answer 1

Answer:

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Answer 2

Class Interval              Frequency          CF

0 - 10                              5                       5

10 - 20                            x                       5 + x

20 - 30                           20                     25 + x

30 - 40                           15                     40 + x

40 - 50                           y                       40 + x + y

50 - 60                            5                       45 + x + y

Then,

Median = 28.5. Thus, class is 20 - 30.

(n/2) = 30, l = 20, h = 10, cf = 5 + x and f = 20.

Median = l + [(n/2) - cf]/f) * h

=> 28.5 = 20 + [(25 - x)/20] * 10

=> 57 = 65 - x

=> x = 8

Also,

∑fi = 60

=> 45 + x + y = 60

=> 45 + 8 + y = 60

=> y = 7

Hence, the values are x = 8 and y = 7

Hope it help!