Create 6 data frames with names as indicated:
1. `temp_my_gather`: Use `gather()` to reshape the data frame to long format. Is this tidy data? Answer the remaining questions using `temp_my_gather`.
2. `city_avg_temp`: Use `group_by()` and `summarise()` to find the mean temperature for each city. Name the new column `mean_temp`.
3. `week_avg_temp`: Create a new column `mean_temp` with the mean temperature for each week.
4. `week_1_temp`: Find the mean temperature for week 1 only.
5. `temp_city_count`: Find the count of observations for each city.
6. `temp_city_summary`: Find the mean, count and standard deviation of temperature for each city.