Hi :)
The mean is the average, and to take the average, they had to do this:
{students' minutes added together} ÷ 14 students = 133 minutes
This is basic pre-algebra; to find the total, we do the reverse of what they did. Since they divided by 14 to get 133, we're going to do the opposite. We're going to multiply 133 by 14 to get the total:
133 × 14 = 1862 minutes
Next question. The typical amount of time a student talked in a week was 133, and you're trying to find the typical amount of time in a day. There are 7 days in a week, so divide 133 by 7 to get the typical number of minutes in a day. (I won't do this for you-- you got this!)
Alright, so 19 students talked 171 minutes on average. Let's go back again and see what the total number of minutes were.
{total} ÷ 19 = 171
{total} = 171 × 19
{total} = 3249
But, hang on. They don't just want to know the total, they want to know the "mean number of minutes the additional five other students talked". That means we have to first subtract the 14 students' total from the 19 students' total to see what the difference is:
3249 - 1862 = 1387
So the five students added 1387 minutes to the average.
Divide 1387 by 5 to see the mean number of minutes per each of the five students.
You got this! Have fun!!
Yes, your answers are correct.
The volume of a cone is given by V = 1/3πr²h. Since the diameter of the first cone is 4, the radius is 2; therefore the volume is
V = 1/3π(2²)(8) = 32π/3
We divide the volume of the sink, 2000π/3, by the volume of the cone:
2000π/3 ÷ 32π/3 = 2000π/3 × 3/32π = 6000π/96π = 62.5 ≈ 63.
The diameter of the second conical cup is 8, so the radius is 4. The volume then is:
V = 1/3π(4²)(8) = 128π/3
Dividing the volume of the sink, 2000π/3, by 128π/3:
2000π/3 ÷ 128π/3 = 2000π/3 × 3/128π = 6000π/384π = 15.625 ≈ 16
Remember this, 5 or higher goes up, 4 or lower the number stays the same. soooo.... lets see how i can start this off...
well,... you could....60 divided by 72 equals.... 0.8333333333333
then, starting from the decimal.. you go two spaces to the right... so thats 83.3333333333
so, since 3 is lower than 4, it would be the same.. and take off the extra three after the decimal. and we're basically... rounding off right??
so your answer should be 80%
Hope i helped!!! :D
I think D is the best option
Answer:
1/64 is 0.015625 in decimals