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Whitepunk [10]
3 years ago
11

a company installs 5000 light bulbs each with an average life of 500 hours and a deviation of 100 hours. find the percentage of

bulbs that can be expected to last the period of time specified assuming the data is normally distributed g
Mathematics
1 answer:
Andrei [34K]3 years ago
8 0

Answer:

Probability is 0

Step-by-step explanation:

The key information is that the data is normally distributed.

In a normal distribution, each individual value of hours has a probability equals to zero. It is a continuos distribution which is centered in the mean value, and where the expected value is the average.

As the distribution it is centered in the mean value, and it is symmetrical, then the probabilty of a bulb lasting more than the mean value is 0.5, and the probabilty of lasting less than avergare is 0.5 as well, but each individual valu is 0

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Ran 12 kilometers in 66 minutes. How many kilometers in 22 minutes
Dafna1 [17]
12/66--->x/22

12/66--->4/22 (almost 4/20 if you know what I mean)
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3 years ago
A triangle drawn on a map has sides of lengths 9 cm, 12 cm, and 15 cm. The shortest of the
Harlamova29_29 [7]

Answer:

26

Step-by-step explanation:

3 0
3 years ago
Ishaan is 3 times as old as Christopher and is also 14 years older than Christopher.
aniked [119]
<span>The correct answer is: 21

Explanation:
Let's first assume few variables!

x = Ishann's age (in years)
y = Christopher's age (in years)

1. Ishann is 3 times as old as Christopher can be represented mathematically as:
x = 3y ---- (1)

2. Ishann is 14 years older than Christopher can be represented mathematically as:
x = y + 14 ---- (2)

Get the value of y from Equation (1) and plug it in Equation (2):

(2) => x = (x/3) + 14
3x = x + 42
2x = 42
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Hence Ishann is 21 years old!</span>
3 0
3 years ago
Read 2 more answers
PLS HELP!<br> What is the frequency of the sinusoidal graph?
docker41 [41]

the frequency of the sinusoidal graph is 2 in 2 π interval

Step-by-step explanation:

The frequency of the graphs refers to the number of the cycles, the graph completes in a given fixed interval.  

We already know the formula that  

         P= (1/ F)

Thus, F= (1/ P)

Where F= frequency and P= Period

Period is the horizontal length (x- axis component) of one complete cycle.

Thus, Observing the above graph

We find that the graph completes 1 cycle in π interval and 2 cycles in 2π interval

Thus, the frequency of the sinusoidal graph is 2 in 2 π interval

3 0
3 years ago
Jamal used his abingdon you buy 15 pounds of flour at 0.42 per pound, 8 pounds of utter the 3.99 per pound, 1 pound of salt at 0
madreJ [45]
15 x .42=      $ 6.30 Flour
8 x 3.99 =    $31.92 Utter
1 x .67 =            .67 Salt
30 x 1.49 = $ 44.70 Apples

Total =  $83.59  
Dollar amount is $83
Change amount is .59
If Jamal had $84.00 to spend his change was .41
8 0
3 years ago
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