The Total solution for NCERT class 6-12
Mean = 32.5 and N= 40
⇒ 2.5 x 12 = 60 – 10f1⇒ 30 =60 – 10f1⇒ 10f1 =60-30 = 30⇒ f1 = 30/10 =3∴ f2 =9 – f1 = 9-3 = 6Hence f1 = 3, f2= 6