Answer:
400 times
Step-by-step explanation:
Range
The range measures the spread of the dataset by calculating the difference between the largest and the smallest element. In your case, marks range from 6 to 10, so the range is 10-6=4.
How many students
The frequency tells you how many students got each mark. So, we know that 5 students got a mark of 6, 4 students got a mark of 7, 7 students got a mark of 8, 10 students got a mark of 9, 4 students got a mark of 10.
This implies that, in total, we have
students.
Mean
The mean is given by the sum of the marks, divided by the number of students. We already observed how many students got each mark, so the sum of all marks will be a weighted sum, where each mark counts once per student:
![5\cdot 6 + 4\cdot 7 + 7\cdot 8+ 10\cdot 9 + 4\cdot 10 = 244](https://tex.z-dn.net/?f=5%5Ccdot%206%20%2B%204%5Ccdot%207%20%2B%207%5Ccdot%208%2B%2010%5Ccdot%209%20%2B%204%5Ccdot%2010%20%3D%20244)
Now we divide this sum by the number of students to get
![\dfrac{244}{30}=8.1\overline{3}](https://tex.z-dn.net/?f=%5Cdfrac%7B244%7D%7B30%7D%3D8.1%5Coverline%7B3%7D)
So, the average mark is about 8.
80p = 80 cents
£1.50 = $1.50.
(changing the signs, that's it)
So if a small bottle is half the size of a large bottle, and is 80 cents.
Amir buys 4 bottles, so 0.80 * 4 = 320 = $3.20.
Now 4 small bottles is the same as 2 large ones, so if he bought 2 large bottles: $1.50 * 2 = $3.00.
$3.20 - $3.00 = 0.20 cents.
Amir would've saved 0.20
P.S. What is "p" in European money
8 + 12 + 20
20 - 9 = 11
11 - 2 = 9
Hope this helps! :)