1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bumek [7]
3 years ago
6

Apply the​ 68-95-99.7 rule to answer the question. The lifetimes of light bulbs of a particular type are normally distributed wi

th a mean of 370 hours and a standard deviation of 7 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of the​ mean?
Mathematics
1 answer:
Montano1993 [528]3 years ago
7 0

Answer:

95%.

Step-by-step explanation:

We have been given that the lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 7 hours.

We are asked to find the percentage of the bulbs whose lifetimes lie within 2 standard deviations to either side of the​ mean using empirical rule.

The empirical rule (68-95-99.7) states that approximately 68% of data points lie within 1 standard deviation of mean and 95% of data points lie within two standard deviation of mean. 99.7% of data points lie within three standard deviation of mean.

Therefore, approximately 95% of data points lie within two standard deviation of mean.

You might be interested in
The current of a river is 4 miles per hour. A boat travels to a point 30 miles upstream and back in 4 hours. What is the speed o
Maurinko [17]
16 mph is the answer I found after doing the work

7 0
2 years ago
Deepak wrote out the steps to his solution of the equation StartFraction 5 Over 2 minus 3 x minus 5 plus 4 x equals negative Sta
Anna35 [415]

Answer:

Step 1 is incorrect.

Step-by-step explanation:

The given expression is :

\dfrac{5}{2}-3x-5+4x=\dfrac{-7}{4}

In step 1, Deepak rearranged the terms in order to simplify like terms together that is followed in step 2.

o, rearranging of the terms of an expression is commutative property and not distributive property.  The distributive property is generally applicable to multiplication and is given as:

x(y+z)=xy+yz

The commutative property is given as:

x+y = y +a

Therefore, adding terms by changing their order is commutative property of addition and not distributive property. Step 1 instruction is wrong.

6 0
3 years ago
Read 2 more answers
The price paid for a $4.50 pen after a 60% discount is applied​
Effectus [21]

Answer:

1.80

Step-by-step explanation:

trust me 100% sure

8 0
2 years ago
Read 2 more answers
∠EFG and ∠GFH are a linear​ pair, m∠EFG=3n+23​, and m∠GFH=2n+32. What are m∠EFG and m∠​GFH?
NARA [144]

the measures of the angles are:

  • m∠EFG = 98°
  • m∠GFH = 82°
<h3>How to find the measures of the angles?</h3>

Two angles are a linear pair if their measures add up to 180°.

Then we will have that:

∠EFG + ∠GFH = 180

Here we know that:

m∠EFG=3n+23

m∠GFH=2n+32

Replacing that we get:

3n + 23 + 2n + 32 = 180

5n + 55 = 180

5n = 180 - 55 = 125

n = 125/5 = 25

Then the measures of the angles are:

m∠EFG=3n+23 = 3*25 +23 = 98°

m∠GFH=2n+32 = 2*25 + 32 = 82°

If you want to learn more about angles:

brainly.com/question/17972372

#SPJ1

8 0
1 year ago
What is the least common multiple of 420 and 196?
maks197457 [2]

2940. To find LCM, listing the multiples may help. Then you will easily be able to view them and circle when you find a common one. :)
4 0
3 years ago
Read 2 more answers
Other questions:
  • HELP PLEASE I HAVE A COUPLE MORE! Please help and fast would be great! BRAINLEST!!!
    15·1 answer
  • PLEASE HELP!!!
    9·1 answer
  • A trapezoid has sides of length 19 meters, 4.4 meters, 19 meters, and 17.2 meters. What is the perimeter?
    7·1 answer
  • Which unit would be best for measuring the thickness of a coin
    11·2 answers
  • Find the regular price. Round to the nearest cent . Sales price is 56.78 percent discount is 40%
    11·1 answer
  • Help me pleasee , timed
    15·2 answers
  • 2x + 3y = -5 <br> y = 3x - 9<br><br><br> Use substitution to solve the system.
    10·1 answer
  • A washing machine cost $ 750. Mr. James bought it at a 40% discount. How much was the discount ?
    8·2 answers
  • Nicole got a prepaid debit card with $25 on it. For her first purchase with the card, she bought some bulk ribbon at a craft sto
    14·1 answer
  • WILL GIVE BRAINLIEST IF CORRECT PLEASE ANSWER!!!!!
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!