For a normal distribution,
a. what z-score separates the highest 10% from the rest of the scores?
b. what z-score separates the highest 30% from the rest of the scores?
c. what z-score separates the lowest 40% from the rest of the scores?
d. what z-score separates the lowest 20% from the rest of the scores?

1.282, -0.5244,...

Step-by-step explanation:

We know that Z is a standard normal variate with mean =0, and std dev =1

a) z-score separates the highest 10% from the rest of the scores

= 90th percentile = 1.282

b) z-score separates the lowest 30% from the rest of the scores

= 30th percentile = -0.5244

c) z-score separates the lowest 40% from the rest of the scores

= 40th percentile = -0.2533

d) z-score separates the lowest 20% from the rest of the score

=20th percentile = -0.8416

the answer to this question is in the pic

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values