machines

The P & R washing machines manufacturing company conducted tests on different models of washing machines with the same drum size to determine the weights they can withstand. The results (in kgs) are 6, 5.5, 7.8, 6.3, 7.2, and 6.7. Find the 95% confidence interval for the mean we..

The annual maintenance cost of a machine in a factory over a three year period is represented in the histogram. By how much did the maintenance cost increase in 1996-97 when compared to 1994-95? => $130 or $100 or $150 or $50..

75,630 people played on slot machines and 93,456 people played card games at a club in a year. Find the total number of people who played either of the games. => 669,087 or 169,088 or 169,085 or 169,086..

The length of a machined part is to be 8.5 cm, with a tolerance of 0.04 cm. Express the tolerance limit as an absolute value inequality. (Use the variable n for the actual measure of the part in cm.) => | n - 8.5 | < 0.04 or | n - 8.5 | ≤ 0.04 or | n + 8.5 | < 0.04 or | n + 8.5 |..

Two hundred bolts were selected at random from the production of 4 machines. The number of defective bolts are 4, 9, 12 and 3. At a significance level α = 0.05, find the chi-square test value and check whether there is a considerable difference between the machines or not...

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..

A field survey shows the lifetime (in years) of a particular model of a washing machine in the frequency distribution table. Lifetime of washing machines Number of washing machines 0 - 2 5 2 - 4 16 4 - 6 13 6 - 8 7 8 - 10 5 10 - 12 4 Find the variance and standard devi..

Find the work input of a machine if its efficiency is 0.93 and work output is 12 z 9 Joules. => 0.78 z 9 Joules or 0 . 0 8 z 9 Joules or 1.29 z 9 Joules or 7.75 z 9 Joules or 12.9 z 9 Joules..

The rate of change of income produced by a vending machine is given by y = 3000 e 0.57 x , 0 ≤ x ≤ 5 where x is the time since the installation of vending machine and y is in dollars per year. Determine the total income generated by vending machine during the fir..

The frequency distribution represents the data obtained from a sample of computer repairs. The values are the mean time (in hours) between repairs on 80 machines. Mean time between repairs Number of machines 25.5 - 28.5 5 28.5 - 31.5 9 31.5 - 34.5 32 34.5 - 37.5 20 37.5 - 40.5 1..