In eduladder you can Ask,Answer,Listen,Earn and Download Questions and Question papers.

Watch related videos of your favorite subject.

Connect with students from different parts of the world.

Apply or Post Jobs, Courses ,Internships and Volunteering opportunity. For FREE

See Our team

Wondering how we keep quality?

Got unsolved questions? Ask Questions

GATE
GMAT
CBSE
NCERT
Career
Interview
Railway
UPSC
NID
NIFT-UG
NIFT-PG
PHP
AJAX
JavaScript
Node Js
Shell Script
Research

## The mean and standard deviation of all 100 items are 50, 5 and that of 150 items are 40, 6 respectively.

## What is the combined mean of the 250 items?A. 43
B. 44
C. 45
D. 46

What is the combined standard deviation of all 250 items? A. 7.1
B. 7.3
C. 7.5
D. 7.7

What is the variance of all the 250 items? A. 50.6
B. 53.3
C. 55.6
D. 59.3

Asked On2019-06-26 11:03:57 by:Jaynil-Gaglani

Taged users:

Likes:

ChocoLite

Dislikes:

Be first to dislike this question

Talk about this Like Dislike

Download question setAnswersNot yet answerdThis question has not found any answer yet! If you know the answer for this question please help us to find an answer.Please read

How to post an answer on eduladder

Lets together make the web is a better placeWe made eduladder by keeping the ideology of building a supermarket of all the educational material available under one roof. We are doing it with the help of individual contributors like you, interns and employees. So the resources you are looking for can be easily available and accessible also with the freedom of remix reuse and reshare our content under the terms of creative commons license with attribution required close.

You can also contribute to our vision of "Helping student to pass any exams"with these.Answer a question:You can answer the questions not yet answered in eduladder.How to answer a questionCareer:Work or do your internship with us.Work with usCreate a video:You can teach anything and everything each video should be less than five minutes should cover the idea less than five min.How to upload a video on eduladder