statistics help!

A community may be considered sociologically healthier the more variability there is in its housing values (up to a point). A major newspaper in one city investigated housing costs in several communities in its area and is running a story on its findings. For one of the communities, a random sample of houses was examined, and the current market price of each house was determined. The newspaper published the following histogram summarizing these prices:

 

 

20

15

10

5

0

Frequency

6

18

9

9

 

80

120

160

200

240

Current market price (in thousands of dollars)

Based on this histogram, estimate the standard deviation of the sample of prices. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.

(If necessary, consult a list of formulas.)