I think this may be false, I know at my old school we did a reach and stretch type flexibility test
The rattle on a rattlesnake is a defense mechanism it’s used to warn predators when aggravated
The mean of this dataset is calculated by summing all of the numbers you have and through diving them with the amount of numbers you have - so
18 + 15 + 22 + 18 + 25+ 19 + 23 = 140
140 / 7 = 20
Mean = 20
