Ashipment of racquetballs with a mean diameter of 60 mm and a standard deviation of 0.9 mm is normally distributed. by how many standard deviations does a racquetball with a diameter of 58.2 mm differ from the mean?

0.9
1
2
3

Mean - diameter then divide by standard deviation

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's