For the normal distribution, find the z-score values that separate the distribution into 3 secitons (a...
For the normal distribution, find the z-score values that separate the distribution into 3 secitons (a body and two tails) as determined by the following percentages. (Round your answers to two decimal places.)
(a) The middle 60% of the distribution from the 40% in the tails.
z = (smaller value)
z = (larger value)
(b) The middle 70% of the distribution from the 30% in the tails.
z = (smaller value)
z = (larger value)
(c) The middle 80% of the distribution from the 20% in the tails.
z = (smaller value)
z = (larger value)
(d) The middle 90% of the distribution from the 10% in the tails.
z = (smaller value)
z = (larger value)
Homework Answers
(a) The middle 60% of the distribution from the 40% in the tails.
z = -0.84163 (Using NORMSINV(0.20) in Excel)
z =0.84163 (Using NORMSINV(0.80) in Excel)
(b) The middle 70% of the distribution from the 30% in the tails.
z = -1.03643 (Using NORMSINV(0.15) in Excel)
z = 1.03643 (Using NORMSINV(0.85) in Excel)
(c) The middle 80% of the distribution from the 20% in the tails.
z = -1.28155 (Using NORMSINV(0.10) in Excel)
z = 1.28155 (Using NORMSINV(0.90) in Excel)
(d) The middle 90% of the distribution from the 10% in the tails.
z = -1.64485 (Using NORMSINV(0.05) in Excel)
z = 1.64485 (Using NORMSINV(0.95) in Excel)
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