Find the area between x = 25 and x 27 under a normal distribution curve with u = 20 and o = 4. Round your answer to four decimal places. A =

Find the​ z-scores for which 75 ​%of the​ distribution's area lies between -z and z.   the z-score are

Find the​ z-score that has 64.4​% of the​ distribution's area to its right.       The​ z-score is enter your response here. ​(Round to two decimal places as​ needed.)

Find the area under the normal curve to the left of z= -1.56 plus the area under the normal curve to the right of z= 2.56. The combined area is?

Find the area of the shaded region. The graph depicts the standard normal distribution of bone density scores with mean 0 and standard deviation 1. z= -1.02 The area of the shaded region is (Round to four decimal places as needed.) Enter your answer in the answer box.

Find the​ z-score that has 6.3% of the distribution's area to its left.  The z score is __________. Round to two decimal places as needed.

Identify the z-score based on the area under the curve.   Find the z-score where 95% (.95) of the curve is below this z-score and 5% (.05) is above.     Find the z-scores between which 95% (.95) of the curve is located, with 2.5% (.025) is left in each tail.

A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Single Policyholders Married Policyholders ni = 412 n2 = 778 Number making claims = 75 Number making claims = 111 a. Use a= 0.05. Test to determine whether the claim rates differ between single and married male policyholders. z-value (to 2 decimals) p-value (to 4 decimals) We cannot conclude that there is the difference between claim rates. b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number.

Sketch the normal curve. 1. Find the area between z= -1.5 and z= -2.5 2. Find the area between z= -1.35 and z=2.95 3. Find the area to the left of z= 2.32 4. Find the area to the right of z= -1.8

Find the area of the shaded region under the standard normal curve. If convenient, use technology to find the area. REE -2.38