Let Xi,i=1,2,..,n be n observations and wi=pxi+k,i=1,2,,n where p and k are constants. If the mean of x′is is 48 and the standard deviation is 12, whereas the mean of w′is is 55 and the standard deviation is 15, then the value of p and k should be
Let S be the set {a∈Z+:a≤100}.If the equation
[tan2x]−tanx−a=0 has real roots (where [ . ] is the greatest
integer function), then the number of elements is S is
If the graph of y = (x – 2)2 – 3 is shifted by 5 units up along y-axis and 2 units to the right along
the x-axis, then the equation of the resultant graph is