Statistics  can someone check me
posted by Rachal .
Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and mathematics.
P(geo and math) = P(geo) + P(math)  P(geo or math)
= 0.65 + 0.60  0.77
= 1.25  0.77
= 0.48
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