The time spent by a customer at a checkout counter has mean 4 minutes and standard deviation 2 minutes. a) What is the probability that the total time taken by a random sample of 50 customers is less than 180 minutes? b) Find the 30th percentile of the total time taken by 50 customers.

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734