The average marks in mathematics of a sample of 100 students was 51 with a standard deviation of 6 marks. Could this have been a random sample from a population with average marks 50?
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A Machine produced 16 defective articles in a batch of 500. After over hauling it produced 3 defectives in a batch of 100. Has the machine improved?
A certain cubical dice was thrown 9000 times and 5 or 6 was obtained 3240 times. On the assumption of certain throwing , do the data indicate an unbiased dice.Test the null hypothesis is accepted or not?
Assume that on an average one telephone number out of fifteen is busy. What is the probability that if six randomly selected telephone numbers are called: (1) not more than three will be busy? (2) at least three of them will be ...
The number of male and female members working in an organization is the example of
The median is another name for the 50th percentile. the difference of the first and third quartiles. the mean the square root of variance.