The back to back stem and leaf plot below show exam scores from two different two different math classes. which class has a greater mean score ? which class has a greater median score?

class a class b
12 4 2
168 5 4
5779 6 16
66789 7 2566
12 8 00489
1 9 3567

B. greater mean = class B greater median = class B

Step-by-step explanation:

None of the expressions is simplified to 41.

Step-by-step explanation:

You have to follow the P.E.M.D.A.S., this is:

P:Parentheses first.

E:Exponent next.

M:Multiplication.

D:Division.

(Multiplication and Division is whichever come first, from left to right)

A: Addition.

S: Subtraction.

(Addition and Subtraction is whichever come first, from left to right).

We are going to analyze every option:

1. 10+ 2.4 - 1

First we have to solve the multiplication:

Now we have to solve the addition and subtraction from left to right:

This is not a correct answer.

2. 10+2.(4-1)

We have to solve the parentheses first:

Now the multiplication and then the addition.

This is not a correct answer.

3. (10+23).4-1

We have to solve the parentheses first:

Now the multiplication and then the subtraction:

This is not a correct option.

4.

We have to solve the parentheses first, in the parenthesis first we have to solve: and then do the multiplication.

Now we have to solve the addition and subtraction from left to right:

This expression is not a correct option.

Then none of the expressions is simplified to 41.