Maurice Tutor

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About Maurice Tutor

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Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 408 Weeks Ago, 6 Days Ago
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 07 Oct 2017 My Price 7.00

bread-making machine

4.19    The average life of a bread-making machine is 7 years, with a standard deviation of 1 year. Assuming that the lives of these machines follow  approximately a normal distribution, find

(a)   the probability that the mean life of a random sam- ple of 9 such machines falls between 6.4 and 7.2 years;

(b)   the value of x to the right of which 15% of the means computed from random samples of size 9 would fall.

 

4.20    The amount of time that a drive-through bank teller spends on a customer is a random variable  with a mean  μ  =  3.2  minutes  and  a  standard  deviation σ = 1.6 minutes. If a random sample of 64  customers is observed, find the probability that their mean time at the teller’s window is

(a)   at most 2.7 minutes;

(b)   more than 3.5 minutes;

(c)   at least 3.2 minutes but less than 3.4 minutes.

Answers

Maurice Tutor
(5)
Status NEW Posted 07 Oct 2017 11:10 PM My Price 7.00

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