Me !
1. the average cost per ounce for glass cleaner is 7.7 cents with a standard devia...
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Mathematics, 06.10.2019 01:00 nataliem02
Me !
1. the average cost per ounce for glass cleaner is 7.7 cents with a standard deviation of 2.5 cents. what is the z-score of glass cleaner with a cost of 10.1 cents per ounce?
a. 0.96
b. 1.31
c. 1.94
d. 4.04
e. none of the above
2. a candy bar takes an average of 3.4 hours to move through an assembly line. if the standard deviation is 0.5 hours, what is the probability that the candy bar will take between 3 and 4 hours to move through the line?
a. 2119
b. 2295
c. 6731
d. 3270
e. 8849
3. the average noise level in a diner is 30 decibels with a standard deviation of decibels. 99% of the time, the noise level is below what value?
a. 16.04
b. 30.00
c. 36.00
d. 43.96
e. 48.00
4. the mean income per household in a certain state is $29,500 with a standard deviation of $5,750. the middle 95% of incomes is between what two values? the incomes are normally distributed.
a. $23, 750 and $35,250
b. $18,000 and $41,000
c. $29,500 and $41,000
d. $12,250 and $46,750
e. $12,325 and $81,550
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