The graph represents a distribution of data.

what is the mean of the data?

This is the graph of a symmetrical normal distribution curve ( a.k.a bell curve). It is perfectly symmetrical with respect to the mean.

So, with respect to which value is the graph symmetrical?

50, as seen in the graph.

So, the mean is 50.

ANSWER: 50

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1