Math  /  Data & Statistics

QuestionFind the zz-score that has 67.4%67.4 \% of the distribution's area to its right.
The z -score is \square 0.07 (Round to two decimal places as needed.)

Studdy Solution

STEP 1

1. We are working with a standard normal distribution, which is symmetric about a mean of 0 and has a standard deviation of 1.
2. The zz-score represents the number of standard deviations a data point is from the mean.
3. We need to find the zz-score such that 67.4% of the distribution's area lies to its right.

STEP 2

1. Determine the cumulative probability to the left of the desired zz-score.
2. Use a standard normal distribution table or calculator to find the corresponding zz-score.

STEP 3

Calculate the cumulative probability to the left of the desired zz-score. Since 67.4% of the distribution's area is to the right, the area to the left is:
10.674=0.326 1 - 0.674 = 0.326

STEP 4

Use a standard normal distribution table or calculator to find the zz-score corresponding to a cumulative probability of 0.326.
The zz-score that corresponds to a cumulative probability of 0.326 is approximately:
z0.44 z \approx -0.44
The zz-score is:
0.44 \boxed{-0.44}

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