Mean scores for elementary schools had 1228 and a standard deviation of 82. What would be the z-score for an elementary school whose mean score was 1300

The z-score for an elementary school whose mean score was 1300 is 0.878

Step-by-step explanation:

The z-score can be calculated from the formula

Where represents the z score

represents the score

is the mean

and is the standard deviation

From the question,

Mean scores for elementary schools had 1228 and a standard deviation of 82, that is

To determine the z-score () for an elementary school whose mean score was 1300, that is

Hence, the z-score is

Hence, the z-score for an elementary school whose mean score was 1300 is 0.878.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

i dont know

step-by-step explanation:

umm. i dont know