Experience has shown that a grade in MAT 2371 is normally distributed with mean 66 and variance 64 and that a grade in MAT 2377 is normally distributed with mean 64 and variance 36. Suppose independence between the grades. Jack is taking MAT 2371 and Jill is taking MAT 2377. Let X denote Jack's grade and let Y denote Jill's grade. Find a constant c so that (X – 66)² (Y – 64)2 + = 0.9 64 36 O 2.706 1.282 0.103 4.605 O 1.645

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