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Category > Statistics Posted 23 May 2017 My Price 5.00

The bonding strength of a drop of plastic glue is normally distributed

6.67    The bonding strength of a drop of plastic glue is normally distributed with mean 100 pounds and standard deviation 8 pounds. A broken plas- tic strip is repaired with a drop of this glue and then subjected to a test load of 90 pounds. What is the probability that the bonding will fail?

6.68    Grading on a curve. The scores on an ex- amination are normally distributed with mean m

   70 and standard deviation s 8. Suppose that the instructor decides to assign letter grades according to the following scheme ( left end- point included ).

 

      Scores              Grade Less than 58                    F

58 to 66                   D

66 to 74                   C

74 to 82                    B

82 and above           A

 

(a)  P [ X   337 ]

(b)  P [ X 240 ]

(c)  P [ X  > 230 ]

(d)  P [ X  > 90 ]

(e) P [235 X  335 ] (f)  P [305 X   405 ]

Answers

Alpha Geek
(8)
Status NEW Posted 23 May 2017 11:05 AM My Price 5.00

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Attachments

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