Ex 13.2, 2 - Chapter 13 Class 10 Statistics

Last updated at August 5, 2026 by

Ex 13.2, 2 - Information on the observed lifetimes (in hours) - Ex 13.2

part 2 - Ex 13.2, 2 - Ex 13.2 - Serial order wise - Chapter 13 Class 10 Statistics
part 3 - Ex 13.2, 2 - Ex 13.2 - Serial order wise - Chapter 13 Class 10 Statistics

Take a fresh quiz. Then take another.
Every attempt is a new AI-adaptive Teachoo quiz with 3 questions, selected from your answers, mistakes, and progress.
Remove Ads

Transcript

Ex 13.2, 2 The following data gives the information on the observed lifetimes (in hours) of 225 electrical components . Determine the modal lifetimes of the components. Mode = l + (𝑓1 βˆ’π‘“0)/(2𝑓1 βˆ’π‘“0 βˆ’π‘“2) Γ— h Modal class = Interval with highest frequency = 60 – 80 where l = lower limit of modal class h = class-interval f1 = frequency of the modal class f0 = frequency of the class before modal class f2 = frequency of the class after modal class Putting values in formula Mode = 60 + (61 βˆ’52)/(2(61)βˆ’52 βˆ’38) Γ— 20 = 60 + 9/(122 βˆ’90) Γ— 2 = 60 + 9/32 Γ— 20 = 60 + 9/8 Γ— 5 = 60 + 5.625 = 65.625 Thus, Modal lifetime of components isο»Ώ 65.625 hours

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.