Question

calculate the standard deviation and variance for the following distribution x= 8,11,17,20,25,30,35
f=2,3,4,1,5,7,3​

Answer 1

Answer:

lass Mid−point

(x) Frequency

(f) xf (x−x) (x−x)2 (x−x)2f 20−24 22 15 330 −10.25 105.0625 1575.9375 25−29 27 25 675 −5.25 27.5625 689.0625 30−34 32 28 896 −0.25 0.0625 1.75 35−39 37 12 444 4.75 22.5625 270.75 40−44 42 12 504 9.75 95.0625 1140.75 45−49 47 8 376 14.75 217.5625 1740.5   ∑f=100 ∑xf=3225  

Answer 2

sorry I don't know if u want give another question