Start by loading the library and data.

library(dslabs)
data(murders)

1. Compute the per 100,000 murder rate for each state and store it in an object called murder_rate. Then use logical operators to create a logical vector named low that tells us which entries of murder_rate are lower than 1.

2. Now use the results from the previous exercise and the function which to determine the indices of murder_rate associated with values lower than 1. Store your result in an object called low_ind.

3. Use the results from the previous exercise to report the names of the states with murder rates lower than 1. Store your result in an object called low_states.

4. Now extend the code from exercises 2 and 3 to report the states in the Northeast region with murder rates lower than 1. Hint: use the previously defined logical vector low and the logical operator &. Store your result in an object called low_ne_states.

5. In a previous exercise we computed the murder rate for each state and the average of these numbers. How many states are below the average? Store your result in an object called states_below_avg