Question

the test marks of the class are 21,24,21,6,15,18,21,45,9 6,27and 15respectively. Find the mean marks of the students and their median marks​

Answer 1

Answer:

The mean is 19 and the median is 19.5

Step-by-step explanation:

Mean:

First you need to need to add up all the numbers which equals 228

Then you need to divide 228 by how many numbers there are which is 12

228 ÷ 12 = 19

Median:

First you need to put all of the numbers in order from smallest to largest:

6,6,9,15,15,18,21,21,21,24,27,45

and then find the number that is in the middle which is 18 and 21. Because there is 2 that means you need to add them together and then divide by 2 because that is how many numbers there are:

18+21 = 39

39 ÷ 2 = 19.5

Hope this helps :)

Answer 2

Answer:

Step-by-step explanation:

arrange them in an order ( that may be ascending or in descending ).

6, 15, 15, 18, 21, 21, 21, 24, 27, 45, 96. ( ascending order ).

mean formula = sum of observations / number of observations.

mean (M)

M = 6+15+15+18+21+21+21+24+27+45+96 / 11

M = 309 / 11

M = 28.0909090909

so, the mean of the above numbers may be 28

median (ME)

median if the sum of the observations(n) are in odd = n+1 / 2

n = sum of the observations = 11

n = 11.

n+1 / 2 = 11+1/2

12 / 2 = 6

here the 6th term is the median.

it means

the median of the above terms are 21

the mean of the above terms is 28.