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A discrete random variable X has this probability distribution.a) Complete the table (10 pts)Compute:b) ๐œ‡ = ๐ธ(๐‘‹) = โˆ‘[๐‘ฅ๐‘ƒ(๐‘ฅ)] = ___________________ (2 points)c) ๐‘‰๐‘Ž๐‘Ÿ(๐‘‹) = โˆ‘[(๐‘ฅ โˆ’ ๐œ‡)2๐‘ƒ(๐‘ฅ)] = ___________________ (2 points)d) Standard deviation. ___________________ (1 points)Note: Answers from b โ€“ d, round off to 2 decimal places. For the table take all decimal places.๐‘ฅ 0 1 2 3 4๐‘ƒ(๐‘ฅ) 0.12 0.25 0.18 0.35 0.10๐‘ฅ๐‘ƒ(๐‘ฅ)๐‘ฅ โˆ’ ๐œ‡(๐‘ฅ โˆ’ ๐œ‡)2(๐‘ฅ โˆ’ ๐œ‡)2๐‘ƒ(๐‘ฅ)

Question

A discrete random variable X has this probability distribution.a) Complete the table (10 pts)Compute:b) ๐œ‡ = ๐ธ(๐‘‹) = โˆ‘[๐‘ฅ๐‘ƒ(๐‘ฅ)] = ___________________ (2 points)c) ๐‘‰๐‘Ž๐‘Ÿ(๐‘‹) = โˆ‘[(๐‘ฅ โˆ’ ๐œ‡)2๐‘ƒ(๐‘ฅ)] = ___________________ (2 points)d) Standard deviation. ___________________ (1 points)Note: Answers from b โ€“ d, round off to 2 decimal places. For the table take all decimal places.๐‘ฅ 0 1 2 3 4๐‘ƒ(๐‘ฅ) 0.12 0.25 0.18 0.35 0.10๐‘ฅ๐‘ƒ(๐‘ฅ)๐‘ฅ โˆ’ ๐œ‡(๐‘ฅ โˆ’ ๐œ‡)2(๐‘ฅ โˆ’ ๐œ‡)2๐‘ƒ(๐‘ฅ)

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Solution

Sure, let's solve this step by step.

First, we need to complete the table. We calculate ๐‘ฅ๐‘ƒ(๐‘ฅ) by multiplying each value of ๐‘ฅ with its corresponding ๐‘ƒ(๐‘ฅ).

๐‘ฅ 0 1 2 3 4 ๐‘ƒ(๐‘ฅ) 0.12 0.25 0.18 0.35 0.10 ๐‘ฅ๐‘ƒ(๐‘ฅ) 0 0.25 0.36 1.05 0.40

Next, we calculate ๐œ‡ = ๐ธ(๐‘‹) = โˆ‘[๐‘ฅ๐‘ƒ(๐‘ฅ)] by adding all the values of ๐‘ฅ๐‘ƒ(๐‘ฅ) we just calculated.

๐œ‡ = 0 + 0.25 + 0.36 + 1.05 + 0.40 = 2.06

Now, we calculate (๐‘ฅ โˆ’ ๐œ‡) and (๐‘ฅ โˆ’ ๐œ‡)ยฒ for each ๐‘ฅ.

๐‘ฅ 0 1 2 3 4 ๐‘ƒ(๐‘ฅ) 0.12 0.25 0.18 0.35 0.10 ๐‘ฅ๐‘ƒ(๐‘ฅ) 0 0.25 0.36 1.05 0.40 ๐‘ฅ โˆ’ ๐œ‡ -2.06 -1.06 -0.06 0.94 1.94 (๐‘ฅ โˆ’ ๐œ‡)ยฒ 4.24 1.12 0.0036 0.88 3.76

Finally, we calculate ๐‘‰๐‘Ž๐‘Ÿ(๐‘‹) = โˆ‘[(๐‘ฅ โˆ’ ๐œ‡)ยฒ๐‘ƒ(๐‘ฅ)] by multiplying each (๐‘ฅ โˆ’ ๐œ‡)ยฒ with its corresponding ๐‘ƒ(๐‘ฅ) and adding them up.

๐‘‰๐‘Ž๐‘Ÿ(๐‘‹) = 4.240.12 + 1.120.25 + 0.00360.18 + 0.880.35 + 3.76*0.10 = 1.01

The standard deviation is the square root of the variance.

Standard deviation = โˆš1.01 = 1.00 (rounded to 2 decimal places)

So, the answers are:

b) ๐œ‡ = 2.06 c) ๐‘‰๐‘Ž๐‘Ÿ(๐‘‹) = 1.01 d) Standard deviation = 1.00

This problem has been solved

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