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Liono4ka [1.6K]
2 years ago
9

Someone please help me will give BRAILIEST!!!!!!

Mathematics
2 answers:
shutvik [7]2 years ago
7 0
Because the problem says or, you are going to use the addition rule for probability. There are 50 cards in the game so, 10/50 + 10/50 = 20/50. 20/50 simplified is 2/5.
                                                                          
asambeis [7]2 years ago
6 0
The answer to this problem is  2/5
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Answer:  The average of the first two test scores is 97.

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Let a1, a2, a3, a4 and a5 be teh scores of Kristle in first , second, third, fourth and fifth tests respectively.

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\dfrac{a1+a2+a3+a4+a5}{5}=94\\\\\Rightarrow a1+a2+a3+a4+a5=94\times5\\\\\Rightarrow a1+a2+a3+a4+a5=470~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)

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\dfrac{a3+a4+a5}{3}=92\\\\\Rightarrow a3+a4+a5=92\times3\\\\\Rightarrow a3+a4+a5=276~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(ii)

Subtracting equation (ii) from equation (i), we get

(a1+a2+a3+a4+a5)-(a3+a4+a5)=470-276\\\\\Rightarrow a1+a2=194\\\\\Rightarrow \dfrac{a1+a2}{2}=\dfrac{194}{2}\\\\\Rightarrow \dfrac{a1+a2}{2}=97.

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