The Mean Of Fifteen Numbers Is 30 And The Mean Of Ten Numbers Is 25. What Is The Mean Of All The Twenty-Five Numbers?

The mean of fifteen numbers is 30 and the mean of ten numbers is 25. What is the mean of all the twenty-five numbers?

 

Answer:

28

Step-by-step explanation:

The mean of fifteen numbers is 30 and the mean of ten numbers is 25. What is the mean of all the twenty-five numbers?

Given: mean of 15 no. = 30

           mean of 10 no. = 25

Required: mean of all 25 no.

Solution:

Get the sum of 15 numbers and the sum of 10 numbers:

sum of 15 numbers  = 30 × 15 = 450

sum of 10 numbers = 25  × 10 = 250

Add the sum of 15 numbers and sum of 10 numbers to get the total sum of all 25 numbers:

Total = 450 +250 = 700

Get the mean of all 25 numbers by dividing the total by 25:

mean of 25 numbers = 700 ÷ 25 = 28


Comments

Post a Comment

Popular posts from this blog

Set A Consists Of The Distinct Letters Of The Word "Advancement"

Set A consists of the distinct letters of the word "advancement"   Answer: A = {a, d, v, n, c, e, m, t} Step-by-step explanation: Distinct letters are letters that are only written once; they are not repeated. To write it in Roster form, simply write the name of the set which usually a variable followed by an equal sign (=). Next, write an open and close curly brackets or also known as the braces { }. Inside the braces will be the elements or the answer to whats being asked. As for this set, it is asking for the distinct letters of the word "advancement". To get the distinct letters of "advancement", simply cancel out letters that are written twice/thrice or more so that only one of each letter is left . #JuneChallenge
Read more

What Are Properties Of Material

What are properties of material   Materials have various properties but there are divided into two major categories: physical and chemical . These properties are important because it enables us to know whether a material is safe or potentially harmful to us. Physical properties of matter are those that can be observed or sensed using the five senses that we have. These include the following: hardness - toughness of a materials brittleness - ability of a material to break into shards or pieces when exposed to stress or force malleability - the ability of a material to be flattened to sheets when exposed to force conductivity - ability of material to conduct electricity elasticity - ablity of a material to go back to its original shape ductility - ability of a material to be made into fine wires odor - ability to be smelled volume -  space occupied The chemical properties of materials are properties that can only be observed when an object undergoes a chemical reaction. These includ...
Read more