Question

write the formula to find the median for group data and explain each term

Answer 1

for even no. of observations-
median = (n÷2)th term

for odd no. of observations-
median =[(n÷2)+(n÷2+1)]÷2th term

here,
n is total no. of observations.
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Answer 2

median = the middle data of the data group, above which there are 50% of the data. 

Order all the data in increasing order or decreasing order.
If there are n data items, then
    if n is odd, find the  (n+1)/2  th term.  That is the median.
    If n is even, then median is the average of   n/2 th  and (n+2)/2 th terms.


Empirical formula for a large data with normal distribution
    mean - mode = 3 (mean - median)
     median = [2 mean + mode] /3

mean is the arithmetic mean of the data given
Mode is the most frequently occurring data item value.