3 years ago

Choose the constant term that completes the perfect square trinomial. y 2 + 5y

1 answer:

5 0

each missing number is the square of half the coefficient of the 1st order term
(5/2)² = 25/4

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$\\\\\Rightarrow\ E(X)=23\cdot (0.16)+25\cdot(0.09)+26\cdot(0.18)+31\cdot(0.12)+34\cdot(0.24)+38\cdot(0.21)\\\\\Rightarrow\ E(X)=30.47$

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