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Recent questions tagged mean-and-standard-deviation

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GATE2020: 24
A normal random variable has mean equal to $0$, and standard deviation equal to $3$. The probability that on a random draw the value of this random variable is greater than $0$ is __________ (round off to $2$ decimal places).

soujanyareddy13 asked in Probability and Statistics Nov 3, 2020

by soujanyareddy13

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GATE2016-GA-6
Students taking an exam are divided into two groups: $P$ and $Q$ such that each group has the same number of students. The performance of each of the students in a test was evaluated out of $200$ marks. It was observed that the mean of group $P$ was $105$, while ... of group $Q$ scored marks in a narrower range than students in group $P$. The median of the marks of group $P$ is $100$.

Milicevic3306 asked in Quantitative Aptitude Mar 26, 2018

by Milicevic3306

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GATE2012-63
Which of the following assertions are CORRECT? P: Adding 7 to each entry in a list adds 7 to the mean of the list Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged P, Q Q, R P, R R, S

Milicevic3306 asked in Quantitative Aptitude Mar 25, 2018

by Milicevic3306

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