Answer:
There are 20 kids total in the class.
Step-by-step explanation:
15/100 × 20 = 3
You can use direct proportion for any percent calculation.
Compare each number with its percent.
3 i
s 15
% of what number? Let the number be x
So, 3 represents 15
% and x represents 100
%
x/
100
= 3/15
Multiply by 100 to isolate x
x = 
x = 20
Check: 15/
100 × 20 = 3
4+28= 32
Think of it as you have 28 apples and someone gave you 4 how many would you have
Answer:
146 people
Step-by-step explanation:
The formula for mean = sum of values/number of values
For Monday to Friday , the average number of people that came = 98
Hence, the total number of people that came is calculated as:
Number of people that attended Monday to Friday = 98 × 5 = 490 people
The number of people that came on Saturday = 162 people
The mean average for the whole week is 114.
The number of days in a week = 7 days
The number of people that came in on Sunday is represented = x
Therefore,
490 + 162 + x/7 = 114
Cross Multiply
652 + x = 798
x = 798 - 652
x = 146 people
Therefore, 146 people visited on Sunday
If the variance is 5 then the standard deviation is √5.
If Z is the score then Z=(8-16)/√5=-3.58 approx.
