bhumika.k.shah wrote:
Just one question!!
how wud it strike to u that u have to take the cumulative frequencY???
Alright, Miss QB! I also enjoy replaying my school days and talking about basics. In Statistics Mean, Median and Mode are known as the measures of central tendencies. Median is the middle most value of the observations when the observations are either arranged in increasing or decreasing order.
Preparing a cumulative frequency distribution table is the first step in calculating the median of the grouped data. The cumulative frequency of a class is obtained by adding the frequencies of all the classes preceding the given class. To calculate the median either the more than or less than cumulative frequency is used.
If the data is converted into a frequency distribution table it is known as grouped data. The median for the grouped data is given by
l + [{(n/2) - c f}/f]*h.
Where
l is lower class limit of median class,
n is total number of observations
c f is the cumulative frequency of the class preceding the median class, and
f is the frequency of the median class and
h is the class size.
But, in this question, we don't have the class intervals to group the data. We straight away have the terms as an alternative to make business far easier. After preparing a cumulative frequency distribution table, in the present case, all we need to look for is which item(s) in order is median, and where would it actually lie. Practicing one or two questions of each kind of distribution would enable any normal aspirant catch the required efficiency on test.
sunil_snath wrote:
Is there something I might have missed in the logic?
Hi sunil, your approach is amazing! Totally appropriate thought under difficult test conditions! I call such events, awe-inspiring!!
