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

Step-by-step explanation:

It’s seen that, the cumulative frequency just greater than

n2n2 (40024002 = 200) is 216 and it belongs to the class interval 3000 – 3500 which becomes the Median class = 3000 – 3500

Lower limits (l) of median class = 3000 and,

Frequency (f) of median class = 86

Cumulative frequency (cf) of class preceding median class = 130 And,

the Class size (h) = 500

Thus, calculating the median by the formula,

we get = 3000 + (35000863500086) = 3406.98

Thus, the median life time of lamps is 3406.98 hours