The insect Megamelus scutellaris can feed on the sap of the water hyacinth, and it has been used as a method of biocontrol for this invasive plant species. M. scutellaris mates on the water hyacinth, and females create oviposition scars on the plant, laying one or more eggs in each scar. In one aspect of this study, the number of eggs laid per scar was measured. The observed number of eggs per scar for 359 scars is given in the Table below.

1 egg/scar 2 eggs/scar 3 eggs/scar 4 eggs/scar 142 194 9 14

1. a)What is the mean number of eggs per scar?
2. b)What is the median number of eggs per scar?
3. c)What is the standard deviation of the number of eggs per scar?