The sum of all even numbers between 31 and 61 is
Sum of first n even numbers = n (n + 1) Required sum = Sum of 30 even numbers from 1 to 60 – sum of 15 even numbers from 1 to 30 = 30 × 31 – 15 × 16 = 930 – 240 = 690
For the frequency distribution of X number of grammatical mistakes per line is as follows.
X: 0 ...
Which option is WRONG?
60% of the employees of a company are college graduates. Of these, 10% are in sales. Of the employees who did not graduate from college, 80% are in sal...
X and Y are independent normal variables with mean 50 and 80 respectively and standard deviation as 4 and 3 respectively. What is the distribution o...
Which of the following is NOT an approach for assigning the probability of the event?
Which of the following options is INCORRECT?
For the given figures of production of a sugar factory, the estimate of the production for 1976 using straight line trend with origin at the year 1972 b...
If the random sample of size n is drawn without replacement from a finite population of size N, the correction factor for standard error of sample mean...
For a random variable x, the central moments (µi) of all order exist. The square of (2j + 1)th moment (µ22j+1) is
