Answer:

Step-by-step explanation:
the mean is given by:

In our case this is:

side note: the main difference between sample mean and population mean is in the 'context'. However, the method to calculate them is the same.
By context I mean: if this the items are taken from some larger category for example: the ages of a few 'students' from a 'class'. Here 'students' are the sample from a larger set that is 'class'. The mean of the 'few students' will be called sample mean. In contrast, if we take the mean of the ages of the whole class then this is called population mean. (population mean == mean of the whole set)
In our case we aren't told exactly where these numbers come from, is this the whole set or a sample from it, the lack of context allows us to assume that the mean can either be population mean or sample mean. So we can safely use any symbol
or
.
Simply divide the number of CDs by the number of shelves. 6422 / 26 = 247 247 CDs per shelf.
16ft
The square root of 256 is 16 which you square to find the area
3x^2+ 2x -18x -12
= (3x^2+ 2x) -(18x+ 12)
= x(3x+ 2) -6(3x+ 2)
= (3x+2)(x-6)
Final answer: (3x+2)(x-6)
Answer:
12
Step-by-step explanation:
let the unknown number is x.
As said in the question, we add half of x to 5 and their sum equals to 11.
steps:
- write the equation.
- do the L.C.M.
- transfer 2 to the other side of the equal sign
- keep x as the subject and do the subtraction on the other side of the equal sign
