1. Attachment
2. We can use an equation for this
100 students - both - nether = 60
lets make x = novels, so comics is 2*x
60 = 2x + x
60 = 3x
x = 20 so 20 people read novels meaning:
3. That 40 people read comics (this can also be done by making x = comics and novels = x/2)
4. This just asks for total of comics only and novels only. We can add up our two previous values or be smart and know that we already calculated that sum as 60 [look back ;) ]
Answer:
The standard deviation for the distribution of scores is 6.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 78
We are given that the distribution of score is a bell shaped distribution that is a normal distribution.
Empirical Formula:
- Almost all the data lies within three standard deviation from mean for a normal data.
- for this rule almost all the data lies within on tandard deviation from the mean.
68% of the scores fall between 72 and 84, thus, we can write:

Thus, the standard deviation for the distribution of scores is 6.
This is the same as averaging. You add them and divide by 2.
((m/n) + (p/q))/2 would be a number in between m/n and p/q.
Do note that n and q must be nonzero, but luckily that is a given.
Answer:
7040
Step-by-step explanation:
C= 2000
B = 20/100 x 2000 = 400 + 2000 = 2400
A= 10/100 x 2400 = 240+2400= 2640
2000 + 2400 + 2640 = 7040