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The grade distribution for a certain class is shown in the table. Grade A IB C D F Frequency of 4 10 18 16 Occurrence

The grade distribution for a certain class is shown in the table. Grade A IB C D F Frequency of 4 10 18 16 Occurrence 2 What is the probability that a student selected at random from this class received a passing grade (D or better)? Round to two decimal places, if necessary, and be sure to express answer in decimal form, not as a percentage. The probability is

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