A book has 280 pages. Of the 280 pages, 210 have printing, 40 have pictures, and 30 are blank. Write your answers as fractions. Represent a fraction using the / symbol.

What is the probability of not opening to a printed page?

1/4

Step-by-step explanation:

printed part = 210

total pages = 280

probability to open printed page 210/280 =3/4

probability to not open printed page = 1 - probability to open printed page = 1 - 3/4 = 1/4

1/4

Step-by-step explanation:

280-210=70

P=70/280=1/4

How to figure out Mean:

Add all numbers together then divide by how many numbers there are.

EXAMPLE:

2+4+6+8= 20

4 / 20 = 5

Mean = 5

How to figure out the Median:

The median is the middle number for example:

2, 3, 7, 5, 1, 9, 0

Now place them in order:

0, 1, 2, 3, 5, 7, 9

eliminate one from each side till you got just one number

0 and 9

1 and 7

2 and 5

3 is left so median is 3