In a frequency curve, what is plotted on the vertical axis?
Class frequencies
In a frequency curve, the vertical axis represents the class frequencies, which indicate the number of observations within each class interval.
Important Questions from Probability and Statistics
In an examination involving multiple choice questions, a student works out the solution in 50% of the questions. In the remaining questions the student guesses the answer. However, when the answer is guessed the probability that it is correct is 0.30. When the student works out the solutions it may be wrong with probability 0.10.
If the answer to a particular question is correct, what is the probability that the student guessed the answer?
A box contains 4 white balls and 3 red balls. In succession, two balls are randomly and removed from the box. Given that the first removed ball is white, the probability that the second removed ball is red is
The probability that a teacher will give an unannounced test during any class is 1/5. If a student is absent twice, then probability that misses atleast one test is
The standard deviation of a uniformly distributed random variable between 0 and 1 is
The second moment of a Poisson-distributed random variable is 2. The mean of the random variable is _______.
