Exercise

# Median life expectancies

In the next exercise, you will create a cumulative time series of the median housing price index in each region. In order to do this, you must first calculate the median housing price index in each year for each region.

Use the `dplyr`

package to complete this task.

Instructions

**100 XP**

- Find the median housing price index (
`house_price`

) for each`region`

within each`year`

using`group_by()`

and`summarize()`

. - Name the new variable
`median_hpi`

.