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a survey of 20 items in a sales ledger has a mean value of r100 and standard deviation of r20 what is the 95 confidence
bcs quality assurance programme chooses a random sample of 50 units and finds that 12 are defective what is the number
henry lom feels that the quantity of chocolates in a particular type of packet has decreased to test this feeling he
sheila brown times 60 people doing a job the mean time is 64 minutes with a standard deviation of 05 minutes how long
a frozen-food packer specifies the mean weight of a product as 200 g the output is normally distributed with a standard
the newisham reservoirnewisham has a population of about 30000 it traditionally got its water supply from the nearby
the following figures show the number of defective components supplied each day by a factory does this data follow a
a car manufacturer says that its cars cost euro500 a year less to maintain than those of its competitors to test this a
a mobile phone has an advertised life of 30000 hours a sample of 50 phones had a life of 28500 hours with a standard
schwartz transport owns a lorry with a oneyear-old engine it has to decide whether or not to replace the engine at a
bremen engineeringjurgen hansmann is the quality control manager of bremen engineering on tuesday morning he got to
hung gho chan make a part on an assembly line at one point they find that 2 of units are defective it costs 1 to
eriksonn catering says that its suppliers should send at most 2 of units that do not meet its lsquooutstanding standard
carn bay components make batches of a basic product in toronto and transfer it to their main manufacturing plant in
annual demand for an item is 2000 units each order costs pound10 to place and the annual holding cost is 40 of the unit
an item of stock has a unit cost of pound40 a reorder cost of pound50 and a holding cost of pound1 a unit a week demand
a company advertises a 95 cycle-service level for all stock items stock is replenished from a single supplier who
hr prewett limited forecasts the demand for one component to average 18 a day over a 200-day working year if there are
beograd inc works 50 weeks a year and has demand for a part that is constant at 100 units a week the cost of each unit
the demand for an item is constant at 100 units a year unit cost is pound50 the cost of processing an order is pound20
templar manufacturingjames templar founded his own manufacturing company when he was 21 years old he has continued to
despite the attention paid to quality management many products still do not meet acceptable standards give some
a lot of software is available for quality control figure 1715 shows a printout from a simple package that takes data
customers arrive for a service at a rate of 100 an hour and each server can deal with 15 customers an hour if customer
piotr banasiewicz is a self-employed plumber who offers a 24-hour emergency service for most of the year calls arrive