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
Reptile [31]
3 years ago
10

The battery standby duration (in hours) of a new model of cell phone is known to be normally distributed. Ten pieces of such new

model of cell phone supplied from the manufacturer are randomly chosen and the actual standby durations are recorded as below:
48.2 47.8 45.6 47.2 49.3
51.2 44.2 45.4 49.2 43.6

The manufacturer claimed that this new model of cell phone has the mean battery standby duration of longer than 46.5 hours. Test at 1% significance level if this claim is true.
Mathematics
1 answer:
emmainna [20.7K]3 years ago
8 0

x = number of hours

want to find probability (P) x >= 13

x is N(14,1) transform to N(0,1) using z = (x - mean) / standard deviation so can look up probability using standard normal probability table.

P(x >= 13) = P( z > (13 - 14)/1) = P(z > -1) = 1 - P(z < -1) = 1 - 0.1587 = 0.8413

To convert that to percentage, multiply 100, to get 84.13%

Please mark me brainliest

You might be interested in
H^-2g for h=3 and g=27
Alexeev081 [22]
Plug h = 3 and g = 27 into the expression:

h^{-2}g=  \dfrac{g}{h^2} = \dfrac{27}{3^2} = \dfrac{27}{9} = 3
3 0
3 years ago
Please help me! I am very confused
Sphinxa [80]

Answer:

1) 22.5  A

2) 112    B

3) 430   L

4) 576   P

5) 486   L

6) 624  S

Code is A B L P L S

Step-by-step explanation:

1) Area of a triangle = 1/2 * base * height = 1/2 *5*9 = 22.5

2) Area of a parallelogram = base x height = 14 x 8 = 112

3) Area of a rectangular prism = 2(length * width) + 2*(length + height) + 2 *(length *height)

= 2(15x7 + 15*5 + 7*5)

= 2(105 + 75 + 35)

= 2 * 215

= 430

4) Volume of a triangular prism = 1/2 * base * length * height

= 1/2 * 8 * 16 * 9

= 576

5) A cube has six surfaces. Each surface has an area of s x s where s is the length of each side. In this case, each side has area of 9x9 = 81. Total surface area = 6 x 81 = 486 and that is the paper required

6) The trailer is a rectangular prism so its volume = length x width x height = 13 6 x 8 = 624

Now you have to look at each value and see which letter it corresponds to. For example answer 1) is 22.5 which lies between 0-100 so it gets letter A, answer (2) is 112 which lies in the range 101-200 so it gets the letter B and so on

4 0
2 years ago
Order from least to greatest 3.2 ,3.14, 19/7, sqrt (14)
Oksanka [162]

Answer: 19/7 ,3.14, 3.2

Step-by-step explanation: Hope this helps Have a brilliant day of learning!

7 0
3 years ago
Carole purchased 7/8 of a pound of chocolate chips to make cookies.On the way home from the store she got hungry and ate 1/4 of
Oksi-84 [34.3K]
7/8 (0.875) minus 1/4(0.25) = 0.625 (5/8)
5 0
3 years ago
I’ll mark you brainlist I’ll mark you brainlist
user100 [1]

Answer:

Undefined

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • For any two integers a and b, (a + b)² = a² + b²
    8·1 answer
  • How can you get 2 17/20 from 2.85
    8·1 answer
  • Why are the mode median and mean call measures of the center?
    10·2 answers
  • A boy 1.5 m tall can just see the sun over a wall 71.5 m high which is
    7·1 answer
  • The Los Angeles Times regularly reports the air quality index for various areas of Southern California. A sample of air quality
    9·1 answer
  • What equation I should use for this problem
    13·1 answer
  • In the figure, point E is on line DG .
    11·1 answer
  • F(x) =(x +1)2– 8<br> x<br> f(x)
    14·1 answer
  • Identify all the sets to which the number belongs. Choose from rational number, irrational number, whole number, an integer.
    7·1 answer
  • Plz help me im vary confused
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!