Arandom sample size 10 was taken from a population. the sample has a variance of zero. which of the following statements must be true?
i) the population also has a variance of zero.
ii) the sample mean is equal to the sample median.
iii) the ten data points in the sample are equal in numerical value.
a) i only
b) ii only
c) iii only
d) i and ii
e) ii and iii

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.