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the lengths of cobs of corn for sale at a supermarket  are normally distributed with a mean of 15.2 cm  and a standard deviation of 3.3 cm

A farmer had bought a truck load of 250 cobs of corn.

 

how many cobs of corn will  be 18 cm or shorter ?

 Apr 1, 2019
 #1
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18 cm is    (18 - 15.2)/3.3 = .8485 (rounded to .85)  HIGHER than the mean......look at your POSITIVE z-score table  under .85 to find the number .8023  this represents the corn cob fraction that is less than 18 cm

.8023 x 250 =~ 200  corn cobs < 18cm  

 Apr 1, 2019

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