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
Alex_Xolod [135]
3 years ago
7

A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution a

pproximated by a normal curve. Find the percentage of bulbs that can be expected to last the period of time. Less than 690 hours
A. 97.06%

B. 47.14%

C. 97.1%

D. 97.2%
Mathematics
1 answer:
SCORPION-xisa [38]3 years ago
7 0
Let X be a random variable representing the number of hours a bulb is expected to last.
P(X < 690) = P(z < (690 - 500)/100) = P(z < 190/100) = P(z < 1.9) = 0.97128 = 97.1%
You might be interested in
If triangle QRS is congruent to triangle XYZ, what are 2 pairs of congruent sides and 2 pairs of congruent angles?
ElenaW [278]
QRS congruent to XYZ,

Look for congruent sides by the corresponding letters, example, 
QR is congruent to XY
QS is congruent to XZ, and RS is congruent to YZ.

Same idea with angles,
angles QRS and XYZ are congruent, 
angles RSQ and YZX are congruent, etc.
8 0
4 years ago
On a Physical Science exam, students earn 3 points for a correct response, 1 point for a partially
ratelena [41]

Answer:

77=c=8

Step-by-step explanation:

4 0
3 years ago
What is the slope of the function?<br> 2/3<br> 3/2<br> 2<br> 6
lutik1710 [3]

Answer:

where's the function

Step-by-step explanation:

8 0
3 years ago
the number m and 5/8 are additive inverses.drag and drop m to their correct positions on the number line.drag and drop the label
monitta

The additive inverse of a number is that number with its sign changed.

The additive inverse of 5/8 is -5/8, so that is the value of <em>m</em>.

The sum of a number and its additive inverse is <em>zero</em>. (This is actually the definition of <em>additive inverse</em>.)

5/8 is found at 5/8 on the number line.

m is found at -5/8 on the number line.

"sum" is found at 0 on the number line.

3 0
4 years ago
Can you help me find this answer<br><br>​
IRISSAK [1]

Answer:

a= 18 girls in the class, b= 20 boys and 15 girls, 12 oranges better price.

Step-by-step explanation:

for question a, there are 18 girls in the class, this is how i worked it out:

the ratio of boys to girls is 4:3.

there are 24 boys.

24 is 6 times more than 4.

if boys are 6 times more than the original ratio, we also have to times the amount of girls by 6.

6x3= 18.

for question b i got 20 boys and 15 girls, this is how i did it.

there are 35 students in total.

4:3= boys to girls.

4+3=7

7 goes into 35 five times.

ratio of boys to girls is 4:3 so 5x4 for boys = 20 and 3x5 for girls = 15.

answer= 20 boys and 15 girls.

12 oranges is a better deal, this is how i worked it out.

it is 60 for 12 oranges.

it is 48 for 8 oranges.

12x5= 60 , 8x6=48.

you only have to times 12 by 5 to get it to the price but you have to times 8 by 6 to get it to the price, proving that 12 oranges for 60 is a better deal.

5 0
4 years ago
Other questions:
  • What’s the perimeter of the square in inches
    14·1 answer
  • Which of these sentences is always true with a parallelogram?
    6·2 answers
  • Solve the system by subsitutuon || x - 3y = -18<br> 5x - 3y = 6
    12·2 answers
  • The number of subscribers y to a newspaper after t years is shown by the equation below.
    8·2 answers
  • Women’s weights are normally distributed with a mean given by µ = 143 lb and a standard deviation given by σ = 29 lb. Find the t
    13·1 answer
  • All motorcyclist wear helmets , I need to write this as in a conditional statement
    13·2 answers
  • Can someone please help me with this and I need it today
    6·1 answer
  • The table below represents a linear function. Identify the rate of change of the function.
    11·1 answer
  • −7m+4&lt;−45 <br><br> its an one-step problem help me please
    15·2 answers
  • Dan has a board that is
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!