Probability that fewer than 120 have a pc
In X-city, 52 % of households have a personal computer. In a random sample of 250 households, what is the probability that fewer than 120 have a PC?
0.2546
0.0918
0.9082
0.1020
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In a poll to estimate presidential popularity, each person in a random sample of 990 voters was asked to agree with one of the following statements: 1. The president is doing a good job.
A set of final examination grades in an introductory statistics course was found to be normally distributed with a mean of 73 and a standard deviation of 8.
The height in the population of hobbits is distributed normally with mean 100cm and standard deviation 10cm. You know that Bilbo the hobbit's height is below average. What is the probability that Bilbo's height is between 92 and 95cm?
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Trichloroacetic acid (CCl3CO2H) is acorrosive acid that is used to precipitate proteins. The pH of a0.050 M solution of trichloroacetic acid is the same asthe pH of a 0.040 M HClO4 solution. Calculate Ka for trichloroace
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