A professional golfer is shopping for a new brand of golf ball.

A professional golfer is shopping for a new brand of golf ball. He likes most of the features of one particular brand, but he wants to make sure that the brand has a desirable spin rate (the rate at which the ball spins on its axis after being struck by a golf club). To test the spin rate of this new brand of ball, the golfer hits the brand of ball on 100 five-iron shots, and a computer measures the spin rate for each shot. The computer then produces the following histogram summarizing the 100 spin rates:

Based on the histogram, find the proportion of spin rates in the sample that are less than 5500 revolutions per minute. Write your answer as a decimal,

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