Question

find the mean median of thr first 20 two digit number​

Answer 1

first 20 two digit no. are : 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

mean = 19.5

median = 20

Answer 2

The first 20 two digit number are : 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29

$n = 20 \: \: \: \: \: ( \: n \: \: is \: \: even) \\ \\ median \: = (\frac{n}{2}) th \: \: and \: \: ( \frac{n}{2} + 1 \: )th \: observation \\ \\ median \: = ( \frac{20}{2} )th \: \: and \: \: ( \frac{20}{2} + 1)th \: observation \\ \\ median \: = 10th \: \: and \: \: 11th \: \: observation$

Median = 19 -- 20 = 19 . 5

mean = sum of observations / total no. of observations}

= 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 / 20

= 390 / 2

= 19 . 5

Mean = 19 . 5