A machine makes catheters for use in heart tests. The machine is designed so that the mean diameter of the catheter it makes can change but the standard deviation can't. The population standard deviation is .05 mm. Right now the machine is supposed to be making catheters with a mean diameter of 2 mm. During production an inspector checks the diameter of catheters to see if the machine has slipped out of the adjustment. A random sample of 50 catheters is taken. If the mean diameter for the sample is 2.04 mm, does this indicate the machine has slipped out of adjustment and the population average diameter of the catheter is no longer 2mm. The best test to use in this situation is a

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First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )