Answer:
200 questions
Step-by-step explanation:
Given data
Let the total questions be x
so that
21% of x= 42 questions
let us solve for x
21/100*x= 42
0.21*x= 42
0.21x= 42
Divide both sides by 0.21
x= 42/0.21
x= 200 questions
Hence the questions are 200 questions
Answer:b=
15c4
/8dt
Step-by-step explanation:
d=
15c4
8bt
Step 1: Multiply both sides by 8bt.
8bdt=15c4
Step 2: Divide both sides by 8dt.
8bdt
8dt
=
15c4
8dt
b=
15c4
8dt
Answer:
b=
15c4
8dt
Answer:
D
Step-by-step explanation:
9 and 1/4 inches is the correct answer
Answer:

And we can calculate the mean with the following formula:

We can calculate the sample variance with this formula:

And the sample deviation would be given by:

Step-by-step explanation:
For this case we have the following data given:
7.9 9.7 9.7 8.7 7.0 7.2 11.3 11.8 7.3 8.1 8.0 11.6 6.8 9.0 6.3 7.0 7.4 8.7 6.8 5.8 7.8 7.7 6.3 7.0 7.7 6.5 10.7
Our variable of interest is given by X="flexural strength (MPa) for concrete beams of a certain type"
And for this case we know that 
And we can calculate the mean with the following formula:

We can calculate the sample variance with this formula:

And the sample deviation would be given by:
