Question

2. What are the parameters (Mean and standard deviation) for a standard normal distribution? 3. Find the critical value for Zoo 4. Find the z score that would give us the area in the right 30% of the standard normal curve. 5. Find the area to the left of z = -0.42. Draw a standard normal curve of the region described. 6. Find the area to the right of z=0.89. Draw a standard normal curve of the region described. 7. Find the area between z = -1 and 2 = 0.90. Drawn a standard normal curve of the region described.

Answer 1

ns. 2) XoN(102) I mean and standard devlation / varrance. 13 20:05 = ± 1.96 / Too failed test) ance. 0.05 4 8 (272) = 0.30 ) = 1-0.30 = 0. To -) 9 (242) = 1-0.30 = 0.70 from z-table, P (2€ 0.52) = 0.70 Z-Score = 0.52 3 P(22-0.42) = (0.33724) 6 P (230.89) -0.920 = 1- P(2£0.89) = -0.91327 = 0.18693 78/-1K 220.90) = P(2<0.9) - P(22-1) = 0.81594-0.15866 0 0.89 - = 10.65728 0.9