Which statement is true of an appropriate sample of a population?
a sample must be a group of people who are the target of the survey question.
a sample should have different characteristics than the population.
a sample must be very small.
a sample should include only boys or only girls.

The correct option is 1.

Step-by-step explanation:

The set of all observations is known as populate set.

A sample is a small subset of population set that is the representative of the entire population. The sample must have sufficient size and it should include all population.

A sample must be a group of people who are the target of the survey question. This statement is true.

Therefore the correct option is 1.

A sample should have different characteristics than the population. This statement is false.

A sample must be very small. This statement is false.

A sample should include only boys or only girls.  This statement is false.

Therefore options 2, 3 and 4 are incorrect.

i can't solve unless i know what the line is

step-by-step explanation:

welcome to/p>

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204