2x+7x=747
9x=747
x=83
83(2) = 166
83(7) = 581
Answer:
12
Step-by-step explanation:
60% of $12
(60 × 20) ÷ 100 = 12
Answer:
I think 5ft 6in tall is maria
In this question we simple wish to calculate the standard error and margin of error from the population. This can be done purely using the standard deviation and sample size.
Standard error
= std dev / (SQRT) n
= 11.5 / SQRT of 70
= 11.5 / 8.366
= 1.374
Margin of error is the standard error multiplied by a Z value that correspondence to a confidence percentage. At a 95% confidence the Z value is 1.96. Therefore
MOE = 1.96 x 1.374 = 2.69