3.49 Attacks by stinging insects, such as bees or wasps, may become medical emergencies if either the victim is allergic to venom or multiple stings are involved. The following data give the number of patients treated each week for such stings in a large regional hospital during 13 weeks last summer.

1 5 2 3 0 4 1 7 0 1 2 0 1 Compute the range, variance, and standard deviation for these data.