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
V125BC [204]
3 years ago
12

Help please I don’t understand

Mathematics
2 answers:
Sphinxa [80]3 years ago
5 0

Answer:

What are the answers

Step-by-step explanation:

mylen [45]3 years ago
3 0
What are the answers
You might be interested in
suppose the mean height for men is 70 inches with a standard deviation of 2 inches. What percentage of men are less than 74 inch
Ratling [72]

Answer:

97.7 %

Step-by-step explanation:

TWO standard deviations above the mean

  z - score = 2   corresponds to .9772    97.7 %

3 0
2 years ago
X-1/2=15 1/4 whats x and show work
ikadub [295]
X-1/2=15 1/4

15  1/4 = 15*4 + 1 = 61/4

61/4

x - 1/2 = 61/4
    +1/2   +1/2

61/4 + 2/4 = 63/4

x = 63/4 
7 0
3 years ago
A certain brand of flood lamps has a lifetime that is normally distributed with a mean of 3,750 hours and a standard deviation o
vesna_86 [32]
Given that mean=3750 hours and standard deviation is 300:
Then:
<span>a. The probability that a lamp will last for more than 4,000 hours?
P(x>4000)=1-P(x<4000)
but
P(x<4000)=P(z<Z)
where:
z=(x-</span>μ)/σ
z=(4000-3750)/300
z=0.833333
thus
P(x<4000)=P(z<0.8333)=0.7967
thus
P(x>4000)=1-0.7967=0.2033

<span>b.What is the probability that a lamp will last less than 3,000 hours?
P(x<3000)=P(z<Z)
Z=(3000-3750)/300
z=-2.5
thus
P(x<3000)=P(z<-2.5)=0.0062

c. </span><span>.What lifetime should the manufacturer advertise for these lamps in order that only 4% of the lamps will burn out before the advertised lifetime?
the life time will be found as follows:
let the value be x
the value of z corresponding to 0.04 is z=-2.65
thus
using the formula for z-score:
-2.65=(x-3750)/300
solving for x we get:
-750=x-3750
x=-750+3750
x=3000</span>
7 0
3 years ago
Miguel e nádia trabalham num escritório de contabilidade. A cada 45 minutos miguel vai á sala de café para relaxar um pouco, enq
Kazeer [188]

Responder:

3 horas

Explicação passo a passo:

Dado :

Miguel a cada 45 minutos

Nádia a cada 60 minutos

Número de horas que eles vão se ver no mesmo lugar:

Para fazer isso ;

Obtenha o menor múltiplo comum de 60 e 45

Múltiplos de:

45: 45, 90, 135, 180, 225.

60: 60, 120, 180, 240, 300.

O menor múltiplo comum de 45 e 60 é 180

° Assim, eles se verão no mesmo lugar após 180 minutos;

Número de horas = 180/60 = 3 horas

6 0
2 years ago
What is 15%of8700 please give the right answer
posledela
15% becomes 0.15
multiply it by 8700
0.15x8700=1305
7 0
2 years ago
Read 2 more answers
Other questions:
  • Explain how to convert 96 oz to pounds.
    6·1 answer
  • There are 240 seventh graders at yorktown middle school. Two thirds of the student participate in after school activities how ma
    12·1 answer
  • Find equation of the line
    8·1 answer
  • Which expression is equivalent to ? A. B. C. D.
    14·2 answers
  • Larry has already read 60 pages out of a 400 page book. He wants to finish the book in the next 20 days. The equation 20x + 60 =
    12·2 answers
  • Common factors of 3x^2y^2,10x^3y^2,6x^2y^2z
    13·1 answer
  • Pls help I’ll brainlest ASAP
    6·2 answers
  • Find the median, mean, lower quartile, upper quartile, interquartile range, and sample standard
    14·1 answer
  • Unos tambores, con una etiqueta de 30 L, son llenados con una solución proveniente de una tina grande. Se agrega una cantidad al
    15·1 answer
  • What is the constant of variation for the following table? If your answer is in the form of a fraction, write your answer in as
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!