Statistics questions
341 published questions with worked solutions.
- Consider the following frequency distribution Class: 0-6, 6-12, 12-18, 18-24, 24-30; Frequency: a, b, 12, 9, 5 If mean = 309 22...
- If the variance of 10 natural numbers 1, 1, 1, ...., 1, k is less than 10, then the maximum possible value of k is _______.
- The arithmetic mean of first n odd natural number is
- The arithmetic mean of 7 consecutive integers starting with a is m. Then, the arithmetic mean of 11 consecutive integers starting...
- The value of n for which x^ n+1 +y^ n+1 x^n+y^n is the geometric mean of x and y is
- Geometric mean of 7,7^2,7^3, 7^n is
- If G is the GM of the product of r set of observation with geometric means G_1,G_2, ,G_r respectively, then G is equal to
- If H is the harmonic mean between P and Q, then the value of HP+ HQ is
- The mean of 10 numbers 7 8, 10 10, 13 12, 16 14, is
- If the mean and variance of the following data: 6, 10, 7, 13, a, 12, b, 12 are 9 and 37 4 respectively, then (a-b)^2 is equal to :
- Let the mean and variance of the frequency distribution x: x_1=2, x_2=6, x_3=8, x_4=9 f: 4, 4, , be 6 and 6.8 respectively. If...
- Let n be an odd natural number such that the variance of 1, 2, 3, 4, ..., n is 14. Then n is equal to _________.
- An online exam is attempted by 50 candidates out of which 20 are boys. The average marks obtained by boys is 12 with a variance...
- The mean of 10 numbers 7 8, 10 10, 13 12, 16 14, ….. is _______
- The first of the two samples in a group has 100 items with mean 15 and standard deviation 3. The whole group has 250 items with...
- Consider the following frequency distribution class: 10–20, 20–30, 30–40, 40–50, 50–60; Frequency: , 110, 54, 30, If the sum of...
- Let the mean and variance of four numbers 3, 7, x and y(x > y) be 5 and 10 respectively. Then the mean of four numbers 3 + 2x, 7...
- The mean and standard deviation of 20 observations were calculated as 10 and 2.5 respectively. It was found that by mistake one...
- Let X_1, X_2, ........, X_ 18 be eighteen observations such that _ i=1 ^ 18 (X_i- )=36 & _ i=1 ^ 18 (X_i- )=90, where and are...
- If the mean deviation about median for the number 3, 5, 7, 2k, 12, 16, 21, 24 arranged in the ascending order, is 6 then the...
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