nework #5 Chapter 6 and 7 Score: 0.33 of 1 pt 31 of 46 (45 complete) 97.2.11-T D

Question

nework #5 Chapter 6 and 7 Score: 0.33 of 1 pt 31 of 46 (45 complete) 97.2.11-T Determine the total area under the standard normal curve in parts (a) through (c) below (a) Find the area under the normal curve to the left of z-1 plus the area under the normal curve to the right of z1 The combined area is 0.3174 (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z -1.55 plus the area under the normal curve to the right of z 2.55 The combined area is (Round to four decimal places as needed.) Enter your answer in the answer box and then click Check Answer Clear All

Explanation / Answer

A) P ( z < -1 ) + P ( z > 1 )

= ( 1 - P ( z < 1 )) + ( 1 - P ( z < 1 ))

= ( 1 - 0.8413 ) + ( 1 - 0.8413 )

= 0.1587 + 0.1587

= 0.3174

B) P ( z < -1.55 ) + P ( z > 2.55 )

= ( 1- P( z < 1.55 )) + ( 1 - P( z < 2.55 ))

= ( 1 - 0.9394 ) + ( 1 - 0.9946 )

= 0.0660

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