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cheesepatrol4878
01.08.2019 •
Mathematics
Ahigh volume manufacture of shafts produces 1000 shafts / day to an advertised specification of 0.250 +/- 0.005”. you are given 30 samples from the day’s production and are asked what % of the shafts are acceptable if the average diameter is 0.251” with a standard deviation of 0.0015”
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Ответ:
99.62%
Step-by-step explanation:
given details:
shaft details 0.250 +/- 0.005 I.e. 0.245 and 0.255
and \mu =0.251
\sigma = .0015
now P[0.245<X<0.255]\
= P\frac{0.245 -0.251}{.0015} <\frac{x-\mu}{6}<\frac{0.255 - 0.251}{.0015}
=P [-4 <Z<2.67]
=P[Z<2.67] -P[Z<-4]
=0.9962 -0.00 [FROM Z TABLES]
=0.9962
=99.62%
Ответ:
x=31 degrees
y=2
Step-by-step explanation: