Math

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mjscruggs

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Feb 21, 2010
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The lifetime of a SuperTough AAA battery is normally distributed with mean = 28.5 hours and standard deviation = 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be if lifetime is 25 hours or less?
 
According to the empirical rule, for a distribution that is symmethical and bell-shaped approximately what percentage of the datavalues will lie within two standard deviations on each side of the mean?
 
A sample of single persons receiving social payments revealed these monthly benefits: $800, $699, $1,087, $880, $839, and $965. How many observations (numbers from this sample) are less than the mean?
 
In how many ways can 12 athletes be awarded a first-place medal, a second-place medal, and a third-place medal?
 
The basketball coach found that 11% of the basketball players have an A average in school. If 2% of the students at the school are basketball players, what is the probability that a student chosen at random will be a basketball player with an A average?
 
Here is an equation that you might want to consider.

(no effort or explanations by you) = (not much help from us)

Also, please read the post titled, "Read Before Posting". After that, please come back here and explain what you already know about this stuff or what you've tried.
 
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