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Find t a/2 for 95% confidence and n = 25

The scores on a college entrance exam have an approximate normal distribution with mean, µ = 52 points and a standard deviation, σ = 11 points. Find the following using the empirical rule. About 68% of the y values lie between [a1] points and [a2] points.  

For the standard normal (Z) probability distribution, the area to the left of the mean is

Sample data set:10        22        12        18        11        27        10        15The midrange of the above data set is:

Find the mean of the data summarized in the given frequency distribution. The following frequency distribution analyzes the scores on a math test. Scores Number of Students 40-49 2 50-59 4 60-69 6 70-79 15 80-89 5 90-99 3  

When the probability of one event has no effect on the probability of another event’s occurrence, the two events are said to be:

Solve the problem. Find the critical value that corresponds to a degree of confidence of 91%.

Use the margin of error, confidence level, and standard deviation,

Fifty part-time students were asked how many courses they were taking this term.  Answer the questions about the frequency table.   # of Courses Frequency 1 30 2 15 3 5   What percent of students take exactly two courses? [answer7]%   What percent of students take one or two courses? [answer8]%  

Find the indicated probability. The following table contains data from a study of two airlines which fly to Small Town, USA. If one of the 87 flights is randomly selected, find the probability that the flight selected arrived on time AND was on the Upstate Airlines.