Time remaining:
Probability and Statistics...PLEASE HELP

Statistics
Tutor: None Selected Time limit: 1 Day

The average salaries of teachers in NJ is $62,500 with a standard deviation of $7,500. A person is chosen at random from this group. What is the probability that:

A. The teacher makes over $80,000?

B. The teacher makes under $65,000?

C. The teacher makes between $60,000 and $70,000

Apr 22nd, 2015

Assume that the salaries distribution is normal. Then reduce the x -estimates to z-estimates and find the corresponding probabilities: z = (x - 62500)/7500 

A. P( x > 80000) = P(z > (80000 - 62500)/7500) = P(z > 2.33) = 0.0099

B. P( x < 65000) = P(z < (65000 - 62500)/7500) = P(z < 0.333) = 0.6304

C. P( 60000 < x < 70000) = P(-0.333 <  z < 1) =  0.4118

Apr 22nd, 2015

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Apr 22nd, 2015
...
Apr 22nd, 2015
May 27th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer