Answer:
77.88 minutes
Step-by-step explanation:
Given that :
Mean (m) = 70
Standard deviation (s) = 10
For 80% of student to complete the exam. In the given time
Using the formula :
Zscore = (X - mean) / standard deviation
80th percentile = 80/100 = 0.8 has a Zscore = 0.7881
0.7881 = (X - 70) /10
0.7881 * 10 = X - 70
7.881 = X - 70
7.881 + 70 = X
77.881 = X
Hence, 77.88 minutes should be given
DescriptionIn mathematics, an inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions. It is used most often to compare two numbers on the number line by their size.
Answer:
20
Step-by-step explanation:
area = length * breadth
320cm² = length * 16cm
divide both sides by 16cm to isolate length
20cm = length
You don't say if the answer needs to be rounded
the height is 77.27 meters ( not rounded)
see attached picture for solution:
You will need 82 1/4 1/2 tiles and 165 1/4 tiles
