Question
What type of lens is used to correct myopia
(shortsightedness)? ÂSolution
Myopia is when nearby objects are clear but distant ones are blurry.  A concave lens diverges light rays to form the image on the retina.  Convex lenses are used for hypermetropia (farsightedness).  This is basic knowledge of corrective optics.
If moment generating function of continuous random variable X is (λ /λ−t) ;t < λ, then E(X3) equals to:
If price-quantity are related for base year (0) and current year (1) are
∑ : p0q0 = 260,∑ : p1q0 = 395,∑ : p0q1 = 264,∑ : p1q1 = 422, t...
A dice was thrown 400 times and 'six' resulted 80 times. The data is used to justify the hypothesis of an unbiased dice at 95% confidence. With referen...
The fair dice is rolled 15 times and face value are noted
Face Value:Â Â Â Â Â Â Â Â 1Â Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â Â 3...
The grouped data for the observation are as follows.
Class :Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2-4Â Â Â Â Â Â Â Â 4-6Â Â Â Â Â Â Â Â Â 6-8<...
The value of k so that following is probability mass function
X:           -2           -1           0  �...
The Mean deviation about Median for the given data.
52, 56, 66, 70, 75, 80, 82 is:
Approximately, the coefficient of variation for the given data where Pearson's second measure of skewness = 0.42, arithmetic mean- 86 and median 80, is:
