Question
A basket contains 3 pink, 4 blue and 5 yellow wools. If
three wools are picked at random, what is the probability that either all are blue or either all are yellow?Solution
Total possible result = 12C3 = 220 Total number of event n(E) = 4C3 + 5C3 = 4 + 10 = 14 Required probability =Â `(n(E))/(n(S))` ` ` Â Â =Â `14/220` Â =Â `7/110`
If the difference between the rank of the 4 observations are 2.5, 0.5, -1.5, -1.5, then Spearman's rank correlation coefficient equals to:
At a round table, n persons are seated on n chairs. The probability that two friends from same college are sitting next to each other, is:
For a distribution with mean, median, mode and standard deviation 25, 24, 26 and 5 respectively, Karl Pearson's coefficient of skewness equals to:
A dice was thrown 400 times and 'six' resulted 80 times. The data is used to justify the hypothesis of an unbiased dice at 95% confidence. With referen...
 X and Y are independent normal variables with mean 50 and 80 respectively and standard deviation as 4 and 3 respectively. What is the distribution o...
 The standard error of the given data 15, 5, 12, 10, 20, 4 is
Which of the following is the most relevant for deriving a point estimate?
For the two variables X and Y, the following observations are tabulated
X:           3             4        �...
The value of k so that following is probability mass function
X:           -2           -1           0  �...
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