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Problem 1: Consider a discrete random variable X representing the number of Stat 3309 students who are mathematics major with corresponding probabilities egin{tabular}{|c|c|c|c|c|c|c|} hline $x$ & 5 & 7 & 8 & 10 & 15 & 20 \ hline $p(x)$ & 0.05 & 0.05 & 0.15 & m & 0.2 & 0.1 \ hline end{tabular} 1. Find m. A. 0.175 B. 0.55 C. 0.45 D. 0.1 E. none of these 2. Find the probability that X is at least 7. A. 0.15 B. 0.2 C. 0.95 D. 0.5 E. none of these 3. Find the expectation of X. A. 11.3 B. 14.7 C. 24.5 D. 32 E. none of these 4. Find the variance for X. A. 32.12 B. 15.61 C. 25.14 D. 66.21 E. none of these 5. Find the standard deviation for X. A. 13.55 B. 21.15 C. 3.95 D. 0.3 E. none of these

          Problem 1: Consider a discrete random variable X representing the number of Stat 3309 students who are mathematics major with corresponding probabilities
egin{tabular}{|c|c|c|c|c|c|c|}
hline
$x$ & 5 & 7 & 8 & 10 & 15 & 20 \
hline
$p(x)$ & 0.05 & 0.05 & 0.15 & m & 0.2 & 0.1 \
hline
end{tabular}

1. Find m.
A. 0.175 B. 0.55 C. 0.45 D. 0.1 E. none of these
2. Find the probability that X is at least 7.
A. 0.15 B. 0.2 C. 0.95 D. 0.5 E. none of these
3. Find the expectation of X.
A. 11.3 B. 14.7 C. 24.5 D. 32 E. none of these
4. Find the variance for X.
A. 32.12 B. 15.61 C. 25.14 D. 66.21 E. none of these
5. Find the standard deviation for X.
A. 13.55 B. 21.15 C. 3.95 D. 0.3 E. none of these

Problem 1: Consider a discrete random variable X representing the number of Stat 3309 students who are mathematics major with corresponding probabilities
egintabular|c|c|c|c|c|c|c|
hline
x 5 7 8 10 15 20 hline
p(x) 0.05 0.05 0.15 m 0.2 0.1 hline
endtabular

1. Find m.
A. 0.175 B. 0.55 C. 0.45 D. 0.1 E. none of these
2. Find the probability that X is at least 7.
A. 0.15 B. 0.2 C. 0.95 D. 0.5 E. none of these
3. Find the expectation of X.
A. 11.3 B. 14.7 C. 24.5 D. 32 E. none of these
4. Find the variance for X.
A. 32.12 B. 15.61 C. 25.14 D. 66.21 E. none of these
5. Find the standard deviation for X.
A. 13.55 B. 21.15 C. 3.95 D. 0.3 E. none of these

Added by Dennis C.

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