The answer to your question is,
B. -0.625
-Mabel <3
Answer:
a) 480 acres
b)640 acres
c)960 acres
d)1120 acres
Step-by-step explanation:
Two combines are able to harvest acres of crops = 320
1 is able to harvest acres of crop = 
Three combines are able to harvest acres of crops = 
= 
Four combines are able to harvest acres of crops = 
= 
Six combines are able to harvest acres of crops = 
= 
Seven combines are able to harvest acres of crops = 
= 
Divide 2282 by 7 which gets you 326. thats equal to one seventh. If 3\7 are boys then you multiply 326 by 3(which is 978). Now that you know the number of boys to the number of students, subtract the number of boys from the number of students (2282-979) which gets you 1304 which is the number of girls at the school
(ans.1304 if you just want the answer)
Answer: 2285
Step-by-step explanation:
Formula to find the sample size is given by :-

, where p = prior estimate of population proportion.
E= Margin of error.
= z-value for confidence interval of c.
Given : Confidence interval : 95%
From the z-value table , the z-value for 95% confidence interval = 
The General Social Survey reported a sample where about 61% of US residents thought marijuana should be made legal.
i.e. the prior estimate of population proportion of US residents thought marijuana should be made legal : p=0.61
[∵ sample proportion is the best estimate for population proportion.]
Margin of error : E= 2%=0.02
Now, the required minimum sample size would be :-

Simplify ,

Thus , we need to survey <u>2285</u> Americans .