i know the correlation is r=0.14286 but i am not sure how to do the steps to get that answer can someone help me?

i know the correlation is r=0.14286 but i am not sure how to do the steps to get that answer can someone help me?

To find out how uniformly babies grow, we measured the weights of random eight babies first at 11 months and then at 27 months. We obtained the following data.

Weight at 11 months            Weight at 27 months

        14                                          25                                   

        14                                          28

        20                                          26

        17                                          24

        15                                          22

        17                                          27

        15                                          23

        16                                          25

Evaluate the correlation coefficient and describe the correlation.