1
GATE CE 2008
MCQ (Single Correct Answer)
+1
-0.3
Three values of $$x$$ and $$y$$ are to be fitted in a straight line in the form $$y=a+bx$$ by the method of least squares. Given $$\,\,\,\sum x = 6,\,\,\sum y = 21,\,\,\sum {{x^2} = 14,\,\,\sum {xy} = 46,\,\,\,\,} $$ the values of $$a$$ and $$b$$ are respectively
A
$$2, 3$$
B
$$1, 2$$
C
$$2, 1$$
D
$$3,2$$
2
GATE CE 2007
MCQ (Single Correct Answer)
+1
-0.3
If the standard deviation of the speed of vehicles in a highway is $$8.8$$ kmph and the mean speed of the vehicles is $$33$$ kmph, the coefficient of variation in speed is
A
$$0.1517$$
B
$$0.1867$$
C
$$0.2666$$
D
$$0.3646$$
3
GATE CE 2003
MCQ (Single Correct Answer)
+1
-0.3
A box contains $$10$$ screws, $$3$$ of which are defective. Two screws are drawn at random with replacement. The probability that none of the two screws is defective will be
A
$$100$$%
B
$$50$$%
C
$$49$$%
D
none
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Fluid Mechanics and Hydraulic Machines
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