What mass of solid that has a molar mass of 89.0 g/mol should be added to 100.0 g of benzene to raise the boiling point of benze
ne by 2.42°C? (The boiling point elevation constant of benzene is 2.53°C•kg/mol.)
Use the equation attached.
2.84 g
8.52 g
21.5 g
93.0 g
Use the equation attached.
2.84 g
8.52 g
21.5 g
93.0 g
1 answer:
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Answer:
The average number of service calls in a 15-minute period is of 14, with a standard deviation of 3.74.
Step-by-step explanation:
In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:
In which
x is the number of sucesses
e = 2.71828 is the Euler number
is the mean in the given interval. The variance is the same as the mean.
Average rate of 56 calls per hour:
This means that , in which n is the number of hours.
Find the average and standard deviation of the number of service calls in a 15-minute period.
15 minute is one fourth of a hour, which means that . So
The variance is also 14, which means that the standard deviation is
The average number of service calls in a 15-minute period is of 14, with a standard deviation of 3.74.