Answer: False, there are actually 900 different three-digit numbers
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Explanation:
The three digit numbers span from 100 to 999, including both endpoints.
This means we have 999-100+1 = 900 different three-digit numbers.
You subtract the endpoints (large-small) and add 1 to include the lower endpoint.
Here's a smaller example of why this works: say you had the set {1,2,3,4} and we wanted to count the number of items in this set. Clearly there are 4 items. Note how subtracting the endpoints 4-1 gets us 3 instead, so we add on 1 to include that left endpoint.
Answer:
QT = 13
Step-by-step explanation:
since R is the midpoint of QS, QR = RS = 4
QT = RT + QR = 9 + 4 = 13
Answer:
27,320,832
Step-by-step explanation:
It is $0.49 per square feet
You need 55,756,800 square feet
Multiply 55,756,800 x 0.49 = 27,320,832
92% of 30 is 27.6 and 48% of 75 is 36, so 27.6<36
Answer:
So, the sample mean is 31.3.
So, the sample standard deviation is 6.98.
Step-by-step explanation:
We have a list of data for the speeds (in miles per hour) of the 20 vehicles. So, N=20.
We calculate the sample mean :
So, the sample mean is 31.3.
We use the formula for a sample standard deviation:
Now, we calculate the sum
Therefore, we get
So, the sample standard deviation is 6.98.
