standard catalog of gem values

The properties of a gas depends upon the temperature and pressure. Hence, it is convenient to specify a particular temperature and pressure for comparison of different gases. The standard conditions of temperature and pressure are abbreviated as S.T.P. (Standard Temperature and..

The heat of formation D H f depends upon the condition of temperature, pressure and physical state (gas, liquid or solid) of the reactants and the products. Therefore the heat change accompanying the formation of one mole of a compound from its elements when all the substances are in their ..

A food processing company must decide to accept or reject an entire shipment of potatoes based on the detailed examination of just a small number of potatoes selected at random from the shipment. The catalog states that the mean weight of a bag is 5 pounds with a standard deviat..

A survey asks 'How much time do you spend in front of the TV in one week? Suppose the responses are normally distributed, the mean is 10 hours and the standard deviation is 2 hours. What value in hours is one standard deviation above the mean, and one standard..

The local authorities in a certain city install 1600 electric lamps in the streets of the city. If the lamps have a mean life rate of 1000 burning hours, with a standard deviations of 150 hours, find the value of - 2 standards deviations form the mean. Assume that the ..

A property value assessor has appraised that the average value of 600 houses in an area was $250,000 and the standard deviation was $80,000. If 50 houses are marked for sale, then find the probability that the mean of the values of these houses is greater tha..

The standard deviation of the scores of 20 students in statistics test is 10 and that of calculus test is 5. Find the F-test value and verify whether the variances for both the tests differ at 90% confidence level. => 2.16, do not differ or 2.54, do not differ or 4, differ or 0...

Find the value of tan θ for an angle θ in the standard position, if the point P(3, 15) is on its terminal side. => 2 3 4 or 1 5 or 5 or 3 2 3 4..

In a report, the standard deviation of the weights of male student athletes is stated as 2 pounds. The standard deviation of weight of a random sample of 24 male student athletes was found as 1.9 pounds. Find the chi-square test value. At α = 0.01 is there enough..