Statistics questions
341 published questions with worked solutions.
- If g is the geometric mean of 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, then which one of the following is correct?
- If the harmonic mean of 60 and x is 48, then what is the value of x?
- What is the mean deviation of first 10 even natural numbers?
- If _ i=1 ^ 10 x_i=110 and _ i=1 ^ 10 x_i^2=1540 then what is the variance?
- Consider the given data with frequency distribution x_i: 3, 8, 11, 10, 5, 4 f_i: 5, 2, 3, 2, 4, 4 Match each entry in List-I to...
- The mean and variance of 10 observation were calculated as 15 and 15 respectively by a student who took by mistake 25 instead of...
- The mean and variance of the data 4, 5, 6, 6, 7, 8, x, y where x < y are 6 and 9/4 respectively. The x^ 4 + y^ 2 is equal to
- A bag contains 4 white and 6 black balls. Three balls are drawn at random from the bag. Let X be the number of white balls, among...
- Suppose a class has 7 students. The average marks of these students in the mathematics examination is 62, and their variance is...
- The mean and standard deviation of 15 observations are found to be 8 and 3 respectively. On rechecking it was found that, in the...
- Let the mean and the variance of 20 observations x_ 1 , x_ 2 , …., x_ 20 be 15 and 9, respectively. For R, if the mean of (x_ 1 +...
- The number of values of a N such that the variance of 3, 7, 12, a, 43 − a is a natural number is :
- Let the mean and the variance of 5 observations x_ 1 , x_ 2 , x_ 3 , x_ 4 , x_ 5 be 24/5 and 194/25 respectively. If the mean and...
- If two variables X and Y are independent, then what is the correlation coefficient between them?
- Consider the following statements : 1. The algebraic sum of deviations of a set of values from their arithmetic mean is always...
- Let the correlation coefficient between X and Y be 0 6. Random variables Z and W are defined as Z=X+5 and W= Y 3 . What is the...
- If all the natural numbers between 1 and 20 are multiplied by 3, then what is the variance of the resulting series?
- The mean and variance of a set of 15 numbers are 12 and 14 respectively. The mean and variance of another set of 15 numbers are...
- Let the mean and variance of 12 observations be 9 2 and 4 respectively. Later on, it was observed that two observations were...
- Let the mean and variance of 8 numbers x, y, 10, 12, 6, 12, 4, 8 be 9 and 9.25 respectively. If x > y, then 3x – 2y is equal to...
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