the first 5 is in the thousands place. The second 5 is in the hundredths place.
The area under the graph of the continuous uniform distribution is 1.
a. The probability that the value will be between 5 and 7 is the area between 5 and 7.

b. The probability that the value will be between 2 and 3 is the are between 2 and 3.
c. The mean is given by:

d. The variance is given by:

The standard deviation is:
The probability of drawing three jacks in a row from a standard deck of cards is, 3/4 or 3:4
So... get the like-terms and add/subtract

see what that gives you