If tan A = √5 – 2 then the value of cot A = 1/tan A = 1/√5 – 2 Now rationalising, => cot A = (1/√5 – 2) x [(√5 + 2)/(√5 + 2)] => cot A = √5 + 2 So, tan A - cot A = (√5 – 2) - (√5 + 2) = -4
If Z1, Z2,…Zn are n independent standard normal variates, then Σni=1 Z2i will follow:
The variation among the observations of each specific class is known as:
The arithmetic mean of the following frequency distribution of number of accidents X on week working days is:
X:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â...
The Mean deviation about Median for the given data.
52, 56, 66, 70, 75, 80, 82 is:
The memory-less property is followed by which of the following continuous distribution:
Following two statements are related to regression coefficient
(I) Independent of the change of origin
(II) Independent of the change of scale
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If the mean and variance of a binomial distribution are 5 and 4, respectively, then the value of n is:
The mode of the given data set is 12. The sum of the frequency on both sides of mode are 16. The skewness:
