Answer:

--- Variance
Step-by-step explanation:
Given

Solving (a): Calculate the mean.
The given data is a grouped data. So, first we calculate the class midpoint (x)
For 51 - 58.

For 59 - 66

For 67 - 74

For 75 - 82

For 83 - 90

So, the table becomes:

The mean is then calculated as:



-- approximated
Solving (b): The sample variance:
This is calculated as:

So, we have:


-- approximated
<h3>
Hello there today we will solve your problem</h3>
here is our equation,
,
Now we will plug in our numbers
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simplify it and we get



A= bh(1/2)
a=12(14)(1/2)
a= 168(1/2)
a= 84inches
Answer:Yes, he is answer is reasonable
Step-by-step explanation:
First, you plus 3 7/10 with 5 4/8.
Then , when you get 8 11/10 you do add mixed number.
Finally, you get the answer that is 9 1/10
Answer:
160 mL of fruit juice and 400 mL of sparkling water
Step-by-step explanation:
According to the statement we have that the ratio between fruit juice and sparkling water is 2/5.
Therefore, we could also say that:
200/500
with it could be done with 200 mL of fruit juice and 500 mL of sparkling water, so for 400 mL, how much would it be:
400 * 200/500 = 160
Therefore, the largest amount of the drink can be made with 160 mL of fruit juice and 400 mL of sparkling water.