## The mean of the series x1, x2 … xn is . If x2 is replaced by , then the new mean is….

The mean of the series x1, x2 … xn is . If x2 is replaced by , then the new mean is

## If ρ (X, Y) = 0.5, Cov (X, Y) = 16 and sx = 4, then sy =….

If ρ (X, Y) = 0.5, Cov (X, Y) = 16 and sx = 4, then sy =

## The probability of getting at least one tails in 4 tosses of a coin is….

The probability of getting at least one tails in 4 tosses of a coin is

## In a factory producing ball point pens, it is found that one out of 50 pens is defective. The pens a….

In a factory producing ball point pens, it is found that one out of 50 pens is defective. The pens are placed in packets of 10 each. Use Poisson distribution to find the number of packets containing more than 2 defective pens in a consignment of 10,000 packets.

## In a box, there are 2 red, 3 black and 4 white balls. Out of these, three balls are drawn together. ….

In a box, there are 2 red, 3 black and 4 white balls. Out of these, three balls are drawn together. The probability of drawing the balls of the same colour is

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## The solution of the equation ….

The solution of the equation

## If the centre of a circle is (2, 3) and a tangent to the circle is x + y = 1, then the equation of t….

If the centre of a circle is (2, 3) and a tangent to the circle is x + y = 1, then the equation of this circle is

## The number of tangents which can be drawn from the point (– 1, 2) to the circle x2 + y2 + 2x &….

The number of tangents which can be drawn from the point (– 1, 2) to the circle x2 + y2 + 2x – 4y + 4 = 0 is

## The director circle is the locus of the point of intersection of….

The director circle is the locus of the point of intersection of

## The area of the circle with centre at (1, 2) and passing through (4, 6) is….

The area of the circle with centre at (1, 2) and passing through (4, 6) is

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