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kati45 [8]
2 years ago
14

The price of an item has dropped to 77$ today. Yersterday it was 140$. Find the percentage decrease.

Mathematics
1 answer:
Yuki888 [10]2 years ago
5 0

Answer: It dropped 55%


Step-by-step explanation: well if you multiply 140x.55 it equals to 77


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3 years ago
find the value of x2 values that separate the middle 90% from the rest of the distribution for 8 degrees of freedom
Anettt [7]

Answer:

With alpha 0.95 and 8 degrees of freedom χ²= 2.73

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But we need the area of the middle so we divide this significance level with 2

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So we will have two values for chi square

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So with alpha 0.95 and 8 degrees of freedom χ²= 2.73

And with alpha 0.05 and 8 degrees of freedom χ²=15.51

This can be shown with a graph.

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