Online Topic lest The ratio of the length of a room to its width is 5 to 3. What is the width of a room if its length is 30 feet?
Length (feet)
Width (feet)
5
3
10
6
15
9
20
12
25
?
30
2
O
A 15 feet
B. 18 feet
C. 20 feet
D. 24 feet

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?