Answer:
For this case we need to check the conditions in order to use the normal approximation:
1)
2)
Since both conditions are satisfied and the independence condition is assumed we can use the normal approximation given by:
The mean would be given by:
And the deviation is given by:
Step-by-step explanation:
For this case we know the following info:
n =60 represent the sample size
represent the estimated proportion of people that will buy a packet of crackers after tasting
For this case we need to check the conditions in order to use the normal approximation:
1)
2)
Since both conditions are satisfied and the independence condition is assumed we can use the normal approximation given by:
The mean would be given by:
And the deviation is given by:
Answer: A
Step-by-step explanation:
So we have 65/1 (65mph), and 260/x, x being the amount of hours we need.
Cross multiply 260 by 1, and 65 by x. Once we do that, divide 260 by 65x.
260/65x.
Divide both sides by 65.
4=x.
It will take him 4 hours. Hope this helps!