Question

100 AAA batteries were tested on a particular MP3 player. Suppose the battery has a mean lifetime of 31.7 hours, with a standard deviation of 2.9 hours. How long do we expect the majority of batteries to last?
A. Between 2.9 and 31.7 hours
B. Between 28.8 and 31.7 hours
C. Between 31.7 and 34.6 hours
D. Between 28.8 and 34.6 hours

Answer 1

The city transit bus is supposed to arrive at a bus stop at 15 minutes past the hour every hour. If the arrival time has a standard deviation of 4 minutes, when should you expect the bus to arrive?
A. Between 11 and 19 minutes past the hour
B. Between 4 and 15 minutes past the hour
C. Between 15 and 19 minutes past the hour
D. Between 11 and 15 minutes past the hour

Answer 2

@charlotte123 these are two different questions.

Answer 3

@katiemoore94 can ya post em sepperatly? ^_^ I will do the first one :)

Answer 4

okay:)

Answer 5

thank u :D I think its A :D

Answer 6

HURRAY :D thank u :D

Answer 7

yep! thankyou

Answer 8

np xD now u can post that bus question :) I already have the answer XD I just dont think we can answer two questions in one post >.>

Answer 9

ok