Answer:
36
Step-by-step explanation:
Data provided in the question:
Standard error = 1.5 minutes ( ∵ number are repetitive 1.51.5 )
Standard deviation = 9 minutes ( ∵ number are repetitive 99 )
Now,
Standard error = ( Standard deviation ) ÷ √n
Here,
n is the sample size
Therefore,
on substituting the respective values, we get
1.5 = 9 ÷ √n
or
√n = 9 ÷ 1.5
or
√n = 6
or
n = 6² = 36
Answer:
Step-by-step explanation:
it will take jocelyn 2 hours to make 120 cookies
Answer:
The question is incomplete, but the step-by-step procedures are given to solve the question.
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 
.
That is z with a pvalue of 
, so Z = 2.575.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M.
The upper end of the interval is the sample mean added to M.
The 99% confidence interval for the population mean amount of beverage in 16-ounce beverage cans is (lower end, upper end).
Answer:
Andrew is 30 years old. Hunter is 65 years old.
Step-by-step explanation:
we can set up 2 equations:
h = 35 + a
h+5 = 2(a+5)
Solve for h in the second equation.
h + 5 = 2a + 10; h = 2a + 5
now set the 2 equations = to each other
2a + 5 = 35 + a
solve for a by combining like terms
a + 5 = 35
a = 30
so Andrew is 30 and Hunter is 35 + 30 = 65.
Sp in 5 years Andrew is 35 and Hunter is 70 (twice A's age)
-4.9t^2 + 6.1t - 0.8 = 0
Subtract 3 from both sides
