All categories

3 years ago

If the mean of 25, 28, a, 30 and 32 is 27, then find the value of a.

Mathematics

1 answer:

Anna11 [10]3 years ago

6 0

Answer:

a = 20

Step-by-step explanation:

The mean is calculated as

mean = $\frac{sum}{count}$

= $\frac{25+28+a+30+32}{5}$ = $\frac{115+a}{5}$

Then

$\frac{115+a}{5}$ = 27 ( multiply both sides by 5 to clear the fraction )

115 + a = 135 ( subtract 115 from both sides )

a = 20

You might be interested in

Pls I need help this

Citrus2011 [14]

Answer:

the third side is 4.

Step-by-step explanation:

Using Pythagorean theorem of a^2 + b^2 = c^2 for right triangles, substitute

the numbers to show ( $\sqrt{65})^{2}$ + $b^{2}$ = $9^{2}$ and solve for b. The square root and square cancel each other out, so you get 65 + $b^{2}$ = 81.

Subtract 65 from both sides to get $b^{2}$ = 16.

Then take the square root of both sides to get b = $\sqrt{16}$ which equals 4.

6 0

3 years ago

Need quick answers has to show work

Zielflug [23.3K]

Answer:

Step-by-step explanation:

For some read I can’t see the pictures

8 0

3 years ago

How to solve for x 2+9x^2=6

juin [17]

Answer:

The answer is : 2/3

Step-by-step explanation:

2+9x^2=6

9x^2 = 6 - 2

9x^2 = 4

x^2 = 4/9

x = √(4/9)

x = 2/3

4 0

3 years ago

Jjjjjjjjjjjjjjjjjjjhhhhhhhhhhhhhhhhbvvvvvvvvvvvvvvvvvvvvv

Bogdan [553]

Answer:

Thanks for the point!

Step-by-step explanation:

Have a great day

5 0

3 years ago

Lisa [10]

Answer:

what? what is this supposed to be?

4 0

3 years ago