Question

The mean of the following distribution is 1080. Find the missing frequency.

Height of trees(in cm) 800-900, 900-1000, 1000-1100, 1100-1200, 1200-1300, 1300-1400, 1400-1500.

No. of trees 10, 15, 8, 12, X, 5, 3 respectively.

Answer 1

∴ Here, n = 250 then,

$\frac{n}{2} = \frac{250}{2} = 125$

⇒  Median class = 150 − 200

$l=150,cf=63,f=90,h=50$

$⇒Median \: 1 + \frac{ \frac{n}{2} - ef}{f} \times h$

$= 150 \frac{125 - 63}{90} \times 50 \\ = 150 + 34.44 \\ = 184.44$

Answer 2

Step-by-step explanation:

options _ a(5) ,b(7) ,c(8), d(6)