machines

Ashley bought a Lathe drilling machine for $150. The machine value decreases by 2% each year. If x denotes the number of years and y represents the machine value, then write an exponential decay model to represent the situation. => y = 150 - 2% x or y = 150(0.98) x or ..

A machine makes 138 copies in 4 hours. How many copies can it make in 66 hours, if number of hours and the number of copies vary directly? => 2277 or 2310 or 2279 or 2275..

A machine makes 182 copies in 4 hours. How many copies can it make in 70 hours, if number of hours and the number of copies vary directly? => 3220 or 3185 or 3187 or 3186..

P & R washing machine manufacturing company conducted tests on different models of washing machines before launching them into the market to know the weights (in kgs) they can withstand for a particular drum size. The results are 6, 5.5, 7, 8, 6.3 and 7.2. Find the standard devi..

P & R washing machine manufacturing company conducted tests on different models of washing machines before launching them into the market to know the weights (in kgs) they can withstand for a particular drum size. The results are 6, 5.5, 7, 8, 6.3 and 7.2. Find the standard devi..

A Factory produces two types of toys A and B with the help of two machines I and II. The two machines I and II can not be used for not more than 1 1 2 hours each to manufacture the toys. The toy A requires 1 minute of machine I and 2 minutes of II, where as a toy B tak..

The double line graph displays the number of Brand X washing machines sold in an appliance store during the first 6 months of the year. How many more top loaders were sold than front loaders in the month of February? => 60 or 40 or 30 or 20..

The table shows the capacities of three different types of lifting machines. Lifting Machine Capacity (in pounds) W1 200 W2 400 W3 600 Which is the most appropriate graph to represent the information shown in the table? => Graph 3 or Graph 2 and Graph 3 or Graph 1 or Graph 2..

A bottling company uses a filling machine to fill plastic bottles with medicine. The bottles are supposed to contain 250 ml. In fact the contents vary according to a normal distribution with mean μ = 248 ml and standard deviation σ = 3 ml. What is the probability that the mean co..

A company claims that the standard deviation of the gear speed for a piece of machinery is 28 revolutions per minute (rpm). An engineer selected a random sample of 20 machines and found the standard deviation as 40 (rpm). At α = 0.01, is there enough evidence to reject the company's..