A student noted the number of cars passing through a spot on a road for 100 periods, each of 3 minutes and summarised this ini the table given below.

A student noted the number of cars passing through a spot on a road for 100 periods , each of 3 minutes , an summarised this in the table given below . {:("Number of cars","Frequency"),(0-10,7),(10-20,14),(20-30,13),(30-40,12),(40-50,20),(50-60,11),(60-70,15),(70-80,8):} Find the mode of the data .

State the number of valence electrons , the group number and the period number of each element given in the following table :

Three coins are tossed 30 times simultaneously. Each time the number of heads occurring was noted down as follows: Prepare a frequency distribution table for the data given above.

Take a clock and fix its minutes hand at 12. Note the angles made by minutes hand in the given intervals of time : Is the angle turned through by the minute hand directly proportional to the time that has passed? Yes! From the above table, you can also see T_(1), T_(2) = A_(1) : A_(2) , becausee T_(1): T_(2) = 15: 30 =1:2 A_(1): A_(2) = 90: 180 =1:2 Check if T_(2): T_(3) = A_(2) : A_(3) and T_(3): T_(4) = A_(3): A_(4) You can repeat this activity by choosing your own time interval.

If f^(11)(x)lt0(gt0) on an interval (a,b) then the curve y=f(x) on this interval is convex (concave) i.e it is below (above) any of its tangent lines If f^(11)(x_(0))=0 or does not exist and the second derivative changes sign when passing through the point x_(0) then the point (x_(0),f(x)) is the = point of inflection of the curve y=f(x) y=x^(4)+ax^(3)+(3)/(2)x^(2)+1 is concave along the entire number scale then