Question

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Suppose a brand of light bulbs is normally​ distributed, with a mean life of

1300 1300

hr and a standard deviation of 150 hr.150 hr.

Find the probability that a light bulb of that brand lasts between

1120 1120

hr and 1510 hr.

Areas Under the Standard Normal Curve

z

A

z

A

1.00

.3413

1.50

.4332

1.10

.3643

1.60

.4452

1.20

.3849

1.70

.4554

1.30

.4032

1.80

.4641

1.40

.4192

1.90

.4713

The probability that a light bulb will

last

between

11201120

hr and

15101510

hr is

 

nothing.

​(Type an integer or decimal rounded to four decimal places as​ needed.)

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the number double which are single

Answer 1