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
If the probability of a bad reaction from a certain injection is 0.001, the chance that out of 2000 individuals, more than two will suffer of a bad reaction is
If x and y are deviation from mean x̅ and y̅ respectively and if r = 0.5, ∑xy = 120, σy = 8 and ∑x 2= 90, what is the value of 'n' ?
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?
The lengths of a large stock of titanium rods follow a normal distribution with a mean (μ) of 440 mm and a standard deviation (σ) of 1 mm. What is the percentage of rods whose lengths lie between 438 mm and 441 mm?
The sum of two normally distributed random variables X and Y is
