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Leviafan [203]
3 years ago
8

A GE Lightbulb is suppose to last for 1200 hours. In fact light bulbs of this type last only 1,185 hours with a standard deviati

on of 70 hours. What is the probability that a randomly selected light bulb will have an average life of at least 1,200?
Mathematics
1 answer:
Andre45 [30]3 years ago
8 0
This can be solved using the formula for t test which is = x - mu over standard deviation divided by the square root of the number of samples. In this case, it is 1185 - 1200 over 70 divided by square root of 100 which give us a value of 2.14 which is equal to .9839 in area. Only rarely, just over one time in a hundred tries of 100 light bulbs, would the average life exceed 1200 hours.
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In the diagram, the measure of angle 6 is 98°.
motikmotik

The measure of angle 7 is 82°.

<h3>What is transversal line?</h3>

A transversal is defined as a line that passes through two lines in the same plane at two distinct points in the geometry

Given:

angle 6= 98°

As, angle 6 and 7 forms a linear pair then

angle 6 + angle 7 = 180

98 +  angle 7= 180

angle= 180-98

angle 7 = 82°

Hence, angle 7 is 82°.

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brainly.com/question/1757859

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2 years ago
If something is burning and 20 acres a minute how many acers in burning a day
g100num [7]
28,800 acres burn per day or in a day.
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3 years ago
OABCD is a pyramid with a rectangular base of sides 15cm by 9cm.Given that the slant height OQ is 16cm find its
crimeas [40]

Hello! Your answer is below... Remember : h = height and v = volume

Answer:

H = 15.35 cm

V = 690.75 m^

Step-by-step explanation:

(H= height, V = volume, ^= square, √ = square root )

1. divide 9/2

=4.5 cm

2. use the pythagorean theorem

H=√16^-4.5^

H=15.35

if your looking for volume

1. use the formula for volume of the pyramid which is:

1/3 x base area x height

or

base area x height /3

2. then you substitute

1/3 x (9)(15) x 15.35

or

(9)(15) x 15.35 /3

V= 690.75 m^

Hope it helped u if yes mark me BRAINLIEST!

Tysm!

:)

3 0
3 years ago
Read 2 more answers
Whats number two if someone can help thanks
OLEGan [10]
It would be c becuase 45/3=15
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3 years ago
How to solve trial and error method i) y + 6 = 11
Sholpan [36]
1.) you have to subtract 6 from both sides to get rid of 6

2.) 11 minus 6 is 5

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4 years ago
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