Abag contains 4 pennies, 6 nickels, and 10 dimes. what is the probability of randomly selecting a nickel or dime from the bag?

16 out of 20 (simplified is 4 out of 5) or 80%

There are 20 coins total and 16 of them are nickels AND dimes so...
16/20=> 4/5
80%
0.8

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.