Solution :
Given that ,
mean = = 7
standard deviation = =0.3
P(x > 7.12) = 1 - P(x <7.12 )
= 1 - P[(x - ) / < (7.12-7) / 0.3]
= 1 - P(z <0.4 )
Using z table,
= 1 -0.6554
=0.3446
b
= 7
= / n = 0.3/ 25 = 0.06
P( > 7.12) = 1 - P( < 7.12)
= 1 - P[( - ) / < (7.12-7) / 0.06]
= 1 - P(z < 2)
Using z table,
= 1 - 0.9772
=0.0228
.
The weights of ice cream cartons are normally distributed with a mean weight of 7 ounces...
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