The area (in percentage) under standard normal distribution curve of random variable Z within limits from –3 to +3 is ______
Explanation:
A standard normal distribution having zero mean and unit variance. A standard normal curve has 99.7% area in limits -3 to +3
Note: A standard normal curve has 68% area in limits -1 to +1 and 95% area in limits -2 to +2.
These are the standard results.
Important Questions from Statistical Variables
Which of these statements on variation is INCORRECT?
For a group of 5 male residents in a society, the mean and standard deviation of their ages are 63 years and 9 years, respectively. For a group of 4 female residents, these values are 54 years and 6 years, respectively. The variance of the combined group of male and female residents is:
Factory A and Factory B employ 476 and 524 employees. respectively. The average weekly salary of an employee in Factory A is $34.5 whereas for an employee in Factory B it is $28.5, The standard deviation in paying the individual salary has been recorded as $5 and $4.5 for Factory A and Factory B, respectively. Which factory has greater variability in paying individual salary?
Among the options for parameters, which option is correct for population?
The formula to calculate the coefficient of quartile deviation is
