Answer:
9
Step-by-step explanation:
radius is half of the diameter
Answer:
The 90% confidence interval for the true mean natural gas bill for homes in the 19808 zip code area in February is between $292.48 and $331.32
Step-by-step explanation:
We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 21 - 1 = 20
90% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 20 degrees of freedom(y-axis) and a confidence level of
. So we have T = 1.7247
The margin of error is:

In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 311.9 - 19.42 = $292.48
The upper end of the interval is the sample mean added to M. So it is 311.9 + 19.42 = $331.32
The 90% confidence interval for the true mean natural gas bill for homes in the 19808 zip code area in February is between $292.48 and $331.32
Jason's part-time job pays him $105 a week
He got an amount of 105 dollars per week
Thhe cost price of the Dit bike = $900
The saving amount he had = $325
So, The amount he require more is the difference in the cost price of the bike to the saving amount
Require amount = 900-325
Require Amount = $575
Since he get the $105 per week
We need to find the number of weeks to get an amount of $575
So, divide the total required amount by the amount in one week he get

So, he neeed to wokr for 6 weeks to pay for the dirt bike
Answer : 6 weeks
Answer:
863 cups
Step-by-step explanation:
step 1
Find the volume of the conical cup
The volume of the cone (cup) is equal to

we have
----> the radius is half the diameter

assume

substitute
step 2
Find out how many cups of water must Carissa scoop out of the sink
Divide the volume of the sink by the volume of the cup
so

Answer:
D
Step-by-step explanation:
I do not know the mathematical answer all i know is that they are congruent