y Probability 10 0.10 20 0.25 30 0.05 40 0.30 50 0.20 60 0.10 The probability distribution of y, a discrete random variable, is
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The quadratic formula is:
and
In this case, a = 2, b = -3, and c = -7
So, we can plug in the numbers to get:
and
Simplifying, we get:
and
You need to use a calculator to find what these would be in decimal form. The answer, rounded to the nearest tenth, is: x = 2.8, x = -1.3