Answer:
1 11/15
Step-by-step explanation:
Answer:
38
Step-by-step explanation:
take the biggest number and subtract it by the smallest number and you will get your answer.
Answer:
the first one and the third one
Step-by-step explanation:
Answer:
--- Standard deviation
Step-by-step explanation:
Given
See attachment for graph
Solving (a): Explain how the standard deviation is calculated.
<u>Start by calculating the mean</u>
To do this, we divide the sum of the products of grade and number of students by the total number of students;
i.e.

So, we have:



Next, calculate the variance using the following formula:

i.e subtract the mean from each dataset; take the squares; add up the squares; then divide the sum by the number of dataset
So, we have:



Lastly, take the square root of the variance to get the standard deviation


--- approximated
<em>Hence, the standard deviation is approximately 11.28</em>
Considering the calculated mean (i.e. 82.76), the standard deviation (i.e. 11.28) is small and this means that the grade of the students are close to the average grade.
Answer:
26.635
Step-by-step explanation:
6.28, the area of the biggest circle
2.355, the area of the little circle
18, the area of rectangular
6.28+2.355+18