Answer:
get stuff out of parentheses solve obvious problems, solve x
The sample mean is the sum of the sample values divided by the number of them:
(7 +7 +10 +6 +9 +6 +8 +7.5 +8.5 +8)/10 = 77/10 = 7.7
The sample mean is 7.7.
Question 1132387: How many liters of a 10% solution should be mixed with 60L of 25% solution to get 15% solution? = one click in Excel = 120. ANSWER. 120 liters of the 10% solution.
- is not included as a rational number !
<u>Step-by-step explanation:</u>
Here we have , following expressions & we need to identify which of the following is not a rational number . Let's find out:
We know that , Rational Number : A number which can be expressed in form of p/q , where q is not equal to zero !
Here Expressions are:
- :
Let's evaluate this expression
⇒
⇒
Therefore , It is a rational number ! .
- :
Let's evaluate this expression
⇒
Therefore , It is a rational number ! .
- :
Let's evaluate this expression
⇒
⇒
Therefore , It is a rational number ! .
- :
Let's evaluate this expression
⇒
⇒
Therefore , It is not a rational number , as pi is included ! .