The following table gives the life time of 200 bulbs Calculate the mean life time of a bulb by - Maths - Statistics

Question

The following table gives the life time of 200 bulbs Calculate the
mean life time of a bulb by step deviation method :
Life time in hrs No of bulbs
400 - 499 24
500 - 599 47
600 - 699 39
700 - 799 42
800 - 899 34
900 - 999 14

Rishabh Mittal · Accepted Answer

<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/ck-files/ck_55dcd97aa5c74%20jpg">
Here , a=749
5 , h=100∑fi=200∑fiui=-143Mean , x=a+h∑fiui∑fi=749
5+100-143200=749 5-71 5=678
Mean life time of a bulb is 678 hours

The following table gives the life time of 200 bulbs. Calculate the mean life time of a bulb by step deviation method : Life time in hrs No. of bulbs 400 - 499 24 500 - 599 47 600 - 699 39 700 - 799 42 800 - 899 34 900 - 999 14

The following table gives the life time of 200 bulbs. Calculate the mean life time of a bulb by step deviation method :
Life time in hrs No. of bulbs
400 - 499 24
500 - 599 47
600 - 699 39
700 - 799 42
800 - 899 34
900 - 999 14