Posted by mira on Wednesday, November 28, 2012 at 9:19am.
the average starting salary of this yaer's graduates of a large university (LU)is $25000 with a standard deviation of $5000.futhermore,it is known that the starting salaries are normally distributed.
a)what is the probability that a randomly selected LU graduate will have a starting of at least $31000?
b)individuals with starting salaries of less than $12200 receive a low income tax break.what percentage of the graduates will receive the tax break?
C)what are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
d)if 68 of the recent gradutes have salaries of at least $35600 , how many students graduated this year from this university>

statistik  PsyDAG, Wednesday, November 28, 2012 at 11:50am
a, b) Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.
c) Use same table to find percent (47.5%) between Z score and mean. Insert Z score in above equation and solve.
d) Find Z score, use table to get %. That % of total = 68.
Answer This Question
Related Questions
 statistics  The average salary for graduates entering the actuarial field is $...
 Statistics  Assume that X, the starting salary offer to psychology majors is ...
 Statistics  Recently, a university surveyed recent graduates of the English ...
 Math/Statistics  The mean starting salary for graduates in the spring of 2004 ...
 statistics  Of the Statistics graduates of a University 30%, received a ...
 statistics  of the physics graduates of a university, 35% received a starting ...
 Probability  The mean annual starting salary of a new graduate in a certain ...
 Stat  The salaries at a corporation are normally distributed with an average ...
 Statistics  You are working as an assistant to the dean of institutional ...
 statistics  Salaries for various positions can vary significantly depending on ...
More Related Questions