PLS HELP * 12 POINTS* I WILL MARK BRAINLIEST
1 answer:
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Answer:
Step-by-step explanation:
For this case we can calculate all the questions with the following table:
Class Midpoint(Xi) fi Xi*fi Xi^2 *fi
____________________________________
0-3 1.5 6 9 13.5
3-6 4.5 6 27 121.5
6-9 7.5 11 82.5 618.75
9-12 10.5 21 220.5 2315.25
12-25 18.5 5 18 1711.25
_____________________________________
Total 49 431.5 4780.25
We can calculate the expected value with the following formula:
And if we replace we got:
We can calculate the sample variance with the following formula:
And replacing we got:
And the deviation would be just the square root of the variance like this:
Answer:
Option D 9 sq units
Step-by-step explanation:
we know that
The area of a triangle is equal to
where
b is the base
h is the height
In this problem we have
substitute in the formula
Answer:
19/27
Step-by-step explanation:
Each time that you roll a dice, there is a 1/3 chance you get a 5/6(assuming you have a fair dice). The probability of rolling that atleast once is the inverse of the probability of rolling a 1-4 each time. There is a chance each time you roll the dice. Thus raising this to the third power results in
. Since we are looking for the inverse probability, we can do:
In order to get our final answer.