Mathematics, 24.10.2019 05:00 tvail613
The life expectancy of a typical lightbulb is normally distributed with a mean of 4,000 hours and a standard deviation of 42 hours. what is the probability that a lightbulb will last between 3,875 and 4,055 hours?
a)0.8835
b)0.7825
c)0.9133
d)0.9035
Answers: 3
Mathematics, 21.06.2019 17:30
Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10
Answers: 2
Mathematics, 21.06.2019 20:00
Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39
Answers: 1
Mathematics, 22.06.2019 00:50
Answer asap. you begin with 1/2 scoop of ice cream. since you're hungry, you ask the vendor for 2/7 more scoops of ice cream. then, you eat 5/8 scoops. how many scoops of ice cream are left on your cone? i will mark brainliest for first correct answer.
Answers: 2
The life expectancy of a typical lightbulb is normally distributed with a mean of 4,000 hours and a...
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