Need a little help with probability

1. Mr. Doodle’s grade distribution over the past 3 years for a course in college algebra is shown in the chart below.

Grade  Number

A         45

B         180

C         110

D         95

F          65

I           5

If Jane plans to take a college algebra course with Mr. Doodle, determine the empirical probability that she receives at least a B.

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