Find the probability that the sum of the values is less than .
The probability that the sum of the values is less than is .
A mean () is and a standard deviation is .
To find the probability that the sums of the values is less than :
Your company has a contract to perform preventive maintenance on thousands of air-conditioners in a large city. Based on service records from previous years, the time that a technician spends servicing a unit averages one hour with a standard deviation of one hour. In the coming week, your company will serve a simple random sample of 70 units in the city. You plan to budget an average of 1.1 hours per technician to complete the work. Will this be enough time?
Previously, De Anza statistics students estimated that the amount of change daytime statistics students carry is exponentially distributed with a mean of . Suppose that we randomly pick daytime statistics students.
a. In words,
c. role="math" localid="1651578876947"
e. Find the probability that an individual had between . Graph the situation, and shade in the area to be determined.
f. Find the probability that the average of the 25 students was between . Graph the situation, and shade in the area to be determined.
g. Explain why there is a difference in part e and part f.
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