Which of the following is true for a median? Group of answer choices For an even number of observations, the median is the mean of the two middle numbers Median can be calculated no matter how the data is arranged A median is only meaningful for interval or ordinal data and not for ratio data Medians are affected by outliers

For an even number of observations, the median is the mean of the two middle numbers

Step-by-step explanation:

The median is the central point of any data set, when sorted in ascending or descending order. Since it only takes into account the central value, unlike the mean, it is not affected by outliers.

For a sample with an odd number of observations, the median is exactly the central value of the data set. For instance, the median of a data set with 3 observations is the 2nd one, while the median of data set with 5 observations is the 3rd one.

For a sample with an even number of observations, the median is mean of the two central values.  For instance, the median of a data set with 4 observations is the mean between the 2nd and 3rd values, while the median of data set with 6 observations is the mean between the 3rd and 4th values.

Therefore, the answer is For an even number of observations, the median is the mean of the two middle numbers.

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1