The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. 1420 1230 985 Assume the population is normally distributed. 692 730 830 720 750 545 629 1446 947 (.... . (a) Find the sample mean. (Round to one decimal place as needed.) X=

Q: b. I-1 3=

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Q: Q5) If X and Y have the joint density function f(x, y) : + xy 0 < x < } + dx).

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Q: Can you just do question c

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A: Yes

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A: Given:

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A: The mean is given by

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A: Given data :  n = 4 u = 35000 o = 5000 P(x &gt; 40000) = ?

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A: First factor the equation

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A: Given that :∫−60​f(x)dx=−8∫06​f(−x)dx=−8If f(x) is even function, then f(-x) = f(x) . Hence, FOR…