Question

Life time (in hours)
Number of lamps
1500-2000
14
2000-2500
56
60
2500-3000
3000-3500
86
74
3500 4000
40.)-2500
4500-5000
62
48

Do it's Cumulative Frequency in More than type value​

Answer 1

Answer:

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Step-by-step explanation:

after median that is

⇒ Median=3000+

86

200−130

×500

⇒ Median=3000+406.98=3406.98

Answer 2

Class interval Frequency Cumulative Frequency

1500−2000 14 14

2000−2500 56 70

2500−3000 60 130

3000−3500 86 216

3500−4000 74 290

4000−4500 62 352

4500−5000 48 400

We have, N = 400 and N/2 = 200, hence median class is 3000−3500.

So, l = 3000, cf = 130,f = 86 and h = 500

Median = l+ (N/2 −cf)/f ×h

⇒ Median = 3000 + 200−130/86 ×500

⇒ Median = 3000+406.98 = 3406.98