how to make data normal using rcmdr? ie dataset (length in cm)

any constants added to the data before transformation?

how to do the kurtosis and skew and SW? how to know if the its significant or not?

are there any ways to make the data normal distribution?

data example:

length 12,12,12,13,13,14,15,15,15,16,16,16,16,17...100