A discrete random variable X has this probability distribution.a) Complete the table (10 pts)Compute:b) ๐ = ๐ธ(๐) = โ[๐ฅ๐(๐ฅ)] = ___________________ (2 points)c) ๐๐๐(๐) = โ[(๐ฅ โ ๐)2๐(๐ฅ)] = ___________________ (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.๐ฅ 0 1 2 3 4๐(๐ฅ) 0.12 0.25 0.18 0.35 0.10๐ฅ๐(๐ฅ)๐ฅ โ ๐(๐ฅ โ ๐)2(๐ฅ โ ๐)2๐(๐ฅ)
Question
A discrete random variable X has this probability distribution.a) Complete the table (10 pts)Compute:b) ๐ = ๐ธ(๐) = โ[๐ฅ๐(๐ฅ)] = ___________________ (2 points)c) ๐๐๐(๐) = โ[(๐ฅ โ ๐)2๐(๐ฅ)] = ___________________ (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.๐ฅ 0 1 2 3 4๐(๐ฅ) 0.12 0.25 0.18 0.35 0.10๐ฅ๐(๐ฅ)๐ฅ โ ๐(๐ฅ โ ๐)2(๐ฅ โ ๐)2๐(๐ฅ)
Solution
Sure, let's solve this step by step.
First, we need to complete the table. We calculate ๐ฅ๐(๐ฅ) by multiplying each value of ๐ฅ with its corresponding ๐(๐ฅ).
๐ฅ 0 1 2 3 4 ๐(๐ฅ) 0.12 0.25 0.18 0.35 0.10 ๐ฅ๐(๐ฅ) 0 0.25 0.36 1.05 0.40
Next, we calculate ๐ = ๐ธ(๐) = โ[๐ฅ๐(๐ฅ)] by adding all the values of ๐ฅ๐(๐ฅ) we just calculated.
๐ = 0 + 0.25 + 0.36 + 1.05 + 0.40 = 2.06
Now, we calculate (๐ฅ โ ๐) and (๐ฅ โ ๐)ยฒ for each ๐ฅ.
๐ฅ 0 1 2 3 4 ๐(๐ฅ) 0.12 0.25 0.18 0.35 0.10 ๐ฅ๐(๐ฅ) 0 0.25 0.36 1.05 0.40 ๐ฅ โ ๐ -2.06 -1.06 -0.06 0.94 1.94 (๐ฅ โ ๐)ยฒ 4.24 1.12 0.0036 0.88 3.76
Finally, we calculate ๐๐๐(๐) = โ[(๐ฅ โ ๐)ยฒ๐(๐ฅ)] by multiplying each (๐ฅ โ ๐)ยฒ with its corresponding ๐(๐ฅ) and adding them up.
๐๐๐(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 = โ1.01 = 1.00 (rounded to 2 decimal places)
So, the answers are:
b) ๐ = 2.06 c) ๐๐๐(๐) = 1.01 d) Standard deviation = 1.00
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