Rubidium-87 decays by beta decay with a half-life of 49 x
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour
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A sample of 10 electronic tubes produced by a company showed a mean lifetime of 1200 hours and a standard deviation of 100 hours. estimate the mean and the standard deviation of the population of all such tubes produced by the company?
What is the difference between data and information? What are characteristics of good information? How does technology improve the decision making process?
A bullet is fired through a board 7.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board, Find the total time the bullet is in contact with the board
A research team conducted a study of soft- drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers and 130 are adults. The researchers secured the following re
A 1.0-kg block of ice is initially at 0°C. Heat is added to this system, and the entropy is increased by 357.1 J/K. How much of the ice melts
During nine days in a festival, the highest sale of a shop was on sunday and was 900„5 more than the average sale for other days. If the standard deviation of the sale during the festival is 33.33, find the standard deviation leaving that the
In a population of 5000 students, a simple random sample of 50 students is selected in order to estimate the weighted average mark for the population.
At what rate does the Sun radiate energy, given that it is essentially a spherical blackbody with 6.96x10^8m, Use appropriate astronomical data to find the solar radiation per unit area at Earth's orbit
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