Answer:x=
Step-by-step explanation:
The standard deviation is 1.98. Option A is correct.
The standard deviation formula is given as
where:
- SS is the sum of squares = 200
- n is the sample size = 51
Substitute the given parameters into the formula to have:

Hence the standard deviation is 1.98
Learn more on standard deviation here: brainly.com/question/12402189
Answer:
Step-by-step explanation:
So basically since she used 15 orange balloons she would have to use 10 green balloons
167.78 / 189.35 = .88608 * 100 = 88.6083971481 round it you get 89
Hey there! :D
When powers are outside the parenthesis, you multiply them.

-2*5= -10
We now have:

When you have a negative exponent, you bring it to the bottom of a fraction to make it positive.

"C" is the correct answer.
I hope this helps!
~kaikers