Mr. bryant is trying to figure out which class project to work on for community service. he surveyed the junior and senior students about their preferred project. the frequency table shows the responses of the students.
juniors seniors total
park cleanup 30 26 56
food kitchen 50 34 84
clothing drive 10 50 60
total 90 110 200
determine the joint frequency of being a senior and wanting to have a park cleanup. explain what this answer represents.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed