Consider the following 8 numbers, where one labelled x
is unknown.

30
,

18
,

34
,

x
,

13
,

36
,

29
,

47

Given that the range of the numbers is 64, work out 2 values of
x
.
x
=

x
=

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?