Word problems
quiz active
time remaining
57: 55
a boat has a speed of 5 mph in calm water. it takes the boat 3 hours to travel upstream but only 2 hours to travel the same
distance downstream. using the data in the table, what is the value of c, the speed of the current?
rate (mph)
time (hr)
distance (mi)
3(5-c)
2(5+c)
upstream
downstream
5-0
1 mph
2.5 mph
5 mph
7.5 mph
mark this and retum
save and exit

(co 3) the times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 9.4 minutes. a random sample of 25 customers has a mean of 36.1 minutes or less. would this outcome be considered unusual, so that the store should reconsider its displays? no, the probability of this outcome at 0.035, would be considered usual, so there is no problem yes, the probability of this outcome at 0.035, would be considered unusual, so the display should be redone no the probability of this outcome at 0.359 would be considered usual, so there is no problem yes, the probability of this outcome at 0.965 would be considered unusual, so the display should be redone