Answer:
see explanation
Step-by-step explanation:
73.
18 = 3x (divide both sides by 3 )
6 = x ( multiply both sides by
)
6 = 3x [
×
= 3 ]
divide both sides by 3
x = 2
74.
24 = 2x ( divide both sides by 2 )
12 = x ( multiply both sides by
)
12 = 2x ( divide both sides by 2 )
x = 6
75.
9 × x = 18
( divide both sides by 9
)
x = 2
76.
2 = x × ( multiply both sides by
)
2 = 4x ( divide both sides by 4 )
x =
Answer:
The sample required is
Step-by-step explanation:
From the question we are told that
The standard deviation is
The margin of error is
Given that the confidence level is 99% then the level of significance is mathematically evaluated as
Next we will obtain the critical value from the normal distribution table(reference math dot armstrong dot edu) , the value is
The sample size is mathematically represented as
substituting values