Answer:
A sample size of 35 is needed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the width W as such
In which 
is the standard deviation of the population and n is the size of the sample.
How large must the sample size be if the width of the 95% interval for mu is to be 1.0:
We need to find n for which W = 1.
We have that 
, then 
. So
Rounding up
A sample size of 35 is needed.
Answer:
63
Step-by-step explanation:
use tangent formula
Answer:
126 miles
Step-by-step explanation:
1/4 inches = 9 miles
Divide 3.5 by 1/4 or 0.25
3.5 ÷ 0.25 = 14
Multiply 14 by 9
14 x 9 = 126
126 miles
Answer:
Raj will take 10 minutes
explanation:-
Raj types 20 words per minute
Saleem types 40 words per minute
I. e speed and time are inversly proportional.
therefore, Raj will take twice the time Saleem takes.
Raj takes 2 * 5 = 10 minutes
Answer:
2 cm
Step-by-step explanation:
The red triangle has legs measuring 1.2 cm and 1.6 cm.
You need x, the length of the hypotenuse.
Use the Pythagorean theorem.
(1.2 cm)² + (1.6 cm)² = x²
4 cm² = x²
x = 2 cm
Answer: 2 cm
