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deelashasharma
18.10.2019 •
Mathematics
The distribution of the weights ofloaves of bread from a certain bakery follow approximately a normaldistribution. based on a very large sample, it was found that 10percent of the loaves weighed less than 15.34 ounces, and 20percent of the loaves weighed more than 16.31 ounces. what are themean and standard deviation of the distribution of the weights ofthe loaves of bread?
a. μ = 15.82, σ =.48
b. μ = 15.82, σ =.69
c. μ = 15.87, σ =.50
d. μ = 15.93, σ =.46
e. μ = 16.00, σ =.50
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Ответ:
D)
Step-by-step explanation:
ASSUMING NORMAL DISTRIBUTION, LESS THAN 10% AT LOWER END
OF 15.34 MEANS [DENOTING MEAN BY M AND Standard Deviation. BY S]
M±AS=20%M-AS=15.34
FOR 20% LEVEL A=1.281FROM TABLES
M-1.281×S=15.341
SIMILARLY
M±BS=40%M+BS=16.31
FOR 40% LEVEL B=0.841FROM TABLES
M+0.841×S=16.312
EQN.2 - EQN.1
2.122×S=0.97
S=0.457=0.46
M=15.926= 15.93
HENCE, D IS THE ANSWER
that is D. μ = 15.93, σ =.46
Ответ:
dialation
Step-by-step explanation: