Answer:
She would spend $52.50.
Step-by-step explanation:
c = 3.5t
c = 3.5(15)
c = $52.50
Hope this helped! :)
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1. Range = 4
2. Total Students = 30
3. Mean = 7.8
Step-by-step explanation:
<u>1. Range</u>
Let us define range first
Range is the difference between the largest and smallest value in a data set
so,
in the given data,
The greatest marks are 10 and smallest are 6.
Range = Largest Value - Smallest Value
= 10-6
=4
<u>2. Total students</u>
To find the total students we will add all the frequencies
So,

Total students are 30
<u>3. Mean:</u>
The mean is given by:

In case of frequency table in the given form, the frequency is multiplies with the data value
Hence,
1. Range = 4
2. Total Students = 30
3. Mean = 7.8
Keywords: Mean, Range
Learn more about mean at:
#LearnwithBrainly
The answer is 8.4 so you would need 9 rolls of ribbon