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Davy Jones owns and operates a chain of grocery stores called "Groceries for less" He is considering a new computer system for accounting and inventory control. A local computer sales office sent the following information about the computer system installation.
Activity Predecessor Duration (wks)a. select the computer model - 6b. design input/output system a 8c. design monitoring system a 8d. assemble computer hardware b 20e. develop the main programs b 18f. develop input/output routines c 10g. create database e 8h. intall system d,f 2I. test and implement g,h 7
a. Construct a network for this problemb. identify the critical path by computing the ET, LT, TS and FS valuesc. Determine project completion time.
SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 116. a) what percentage of SAT scores are between 399 and 631?
If three systems are installed, what is the probability that at least one of the systems will detect the attack? Would you recommend that multiple detection systems be used? Explain.
Define probability and explain its three perspectives. Provide an example of each. Explain the concept of mutually exclusive events. How do you compute the probability P(A or B) when A and B are, and are not, mutually exclusive.
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
it labels the top 5% (the heaviest 5%) overweight. How heavy does a box have to be for it to be labeled overweight? Round your answer to the nearest hundredth.
What is the half-width (from the middle of the confidence interval to either of the confidence limits) of the 99% confidence interval for the population mean time spent on investment research by portfolio managers?
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
Use the Rare Event Rule. Does the evidence support the claim?
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
Participants is approximately a normal distribution with a mean of 68 years and a standard deviation for 3.5 years. What proportion of the plan recipents die before they reach the standard retirement age of 65.
Let X equal the number of cells activating the alarm when the temperature reaches 100_Fahrenheit. Find the probability that the alarm will function when the temperature reaches 100_F.
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