The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct
mean is:
1). 39
2). 39.7
3). 40.3
4). 42.7
AD is the Median of $\triangle$ ABC. If O is the centroid and AO = 10 cm then OD is
1). 5 cm
2). 20 cm
3). 10 cm
4). 30 cm
The centroid of a triangle is the point where
1). the medians meet
2). the altitudes meet
3). the right bisectors of the sides of the triangle meet
4). the bisectors of the angles of the triangle meet
If 2x+$\frac{2}{x}$=3, then the value of $x^{3}+\frac{1}{x^{3}}+2$ is
1). 7
2). 9
3). $\frac{7}{8}$
4). 5
Sound travels at 330 metres per second. The distance (in kilometres) of a thunder cloud when its sound follows the flash after 10 seconds is
1). 0.33 KM
2). 3.3 KM
3). 33 KM
4). 33.3 KM