the average wind speed in Chicago for the first 10 days in January is listed below. find the z score for a day with a wind speed of 20mph

date wind speed

1/1. 14.2

1/2. 12

1/3. 11.6

1/4. 10

1/5. 10.1

1/6. 8.8

1/7. 7.4

1/8. 6.4

1/9. 9.9

1/10. 17.7