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slava [35]
3 years ago
13

A box of LED light bulbs was tested to see how long the light bulbs last. The standard deviation of the light bulb lifetime data

was five years. Which of the following is the best interpretation of this value?
Fifty percent of the light bulb lifetime data is below five years.
The difference between the longest and shortest light bulb lifetime was five years.
The lifetime of the light bulbs typically varies by about five years from the mean.
The middle half of the light bulb lifetime data has a range that is five years wide.
Mathematics
1 answer:
SOVA2 [1]3 years ago
3 0

Answer:

the answer is B

Step-by-step explanation:

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BRAINLIEST ANSWER TO FIRST ANSWERER!!!!!
krok68 [10]

Answer:

Option C \frac{1}{2}(185\°-x\°)=76\°

Step-by-step explanation:

we know that

The measurement of the <u>exterior angle</u> is the semi-difference of the arcs it comprises

so

76\°=\frac{1}{2}(arc\ ST-arc\ XZ)

we have

arc\ ST=185\°

arc\ XZ=x\°

substitute

76\°=\frac{1}{2}(185\°-x\°)

Rewrite

\frac{1}{2}(185\°-x\°)=76\°


4 0
3 years ago
Read 2 more answers
The capacity of a small children’s swimming pool is 106 gallons of water. There are currently 15 gallons of water in the pool. Y
Evgen [1.6K]

Answer:

1. y=2x+15

2. 45.5 min

Step-by-step explanation:

1. You find 2x by looking at the give rate of gallons (2) a min (x). This information is given in the word problem. This gives the equation of y=2x. But you already have 15 gallons in the pool, so you need to add the +15 at the end of the equation giving you y=2x+15.

2. Y is the total gallons. This is 106 gallons (given in the word problem). We are trying to solve for x (# of minutes to fill the pool). 106=2x+15. subtract 15 from both sides giving 91=2x. Divide both sides by 2 giving x=45.5. It will take 45.5 minutes to fill up the pool.

3 0
3 years ago
A school of salmon was swimming in the river 5 feet below the surface. To escape a hungry bear, they went down another 3 feet. W
garik1379 [7]

Answer:

8 Feet below the surface

Step-by-step explanation:

If the salmon were initially 5 feet below the surface, and then travelled down an additional 3 feet from the initial 5, then the new position would be 8 feet down relative to the surface.

You can write this as -5 + -3 = -8, assuming that 0 represents surface level.

Cheers.

3 0
3 years ago
Read 2 more answers
The following graph represents the equation y=-3/2x+3?
____ [38]

Answer:

yes

Step-by-step explanation:

7 0
3 years ago
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The price of a flight was increased by 3% to £650. What was the price before the increase? Give your answer to the nearest penny
kramer

Answer:

269

Step-by-step explanation:

4 0
2 years ago
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