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
sweet [91]
3 years ago
11

The average runtime of a Macbook air is 6 hours with standard deviation 1 hour. Now suppose the frequency distribution of the ru

ntime of all Macbook airs is known to be bell shaped. What percentage approximate all Macbook airs run for less than 5 hours?Group of answer choices20.5%84%54%16%
Mathematics
1 answer:
Dmitrij [34]3 years ago
3 0

Answer:

16%

Step-by-step explanation:

Problems of normally distributed (bell-shaped) samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 6, \sigma = 1

What percentage approximate all Macbook airs run for less than 5 hours?

This is the pvalue of Z when X = 5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{5 - 6}{1}

Z = -1

Z = -1 has a pvalue of 0.1587

Rounding up, 16% is the correct answer.

You might be interested in
PLEASE ANSWER THIS? WHAT IS EG
crimeas [40]
It's the points of the triangle E----------G
They are the twin points
5 0
2 years ago
Write a system of equations for the following situation:
wariber [46]

Answer: B) a + c = 10

8a + 5c = 59

Step-by-step explanation:

We know that 10 total people went, so the first equation has to be equal to 10. The total was $59, so the second equation should be set equal to $59. Now that the second equation is for cost, we must make it 8a + 5c to represent the cost of the adult and child tickets which are $8 and $5, respectively.

5 0
3 years ago
Read 2 more answers
Model -2/4+3/4 on a number line
trasher [3.6K]

Answer:

Step-by-step explanation:

4 0
3 years ago
I need help with this question
Svetlanka [38]

Answer:

b

Step-by-step explanation:

3 0
3 years ago
Students taking a make-up test receive the following grades: 77, 89, 88, 67, 91, 95, 83, 79, 81, and 65. Which grade has a perce
mixas84 [53]
The answer would be 67


8 0
3 years ago
Other questions:
  • Justin gave the clerk $20 to pay a bill of $6.57. How much change should Justin get?
    6·1 answer
  • T^4/5<br><br> Write as a radical expression!<br> Will mark brainliest!
    13·2 answers
  • What z score in a normal distribution has 33% of all score above it? ap stats quiz 2.2a answers?
    8·1 answer
  • 8.Find the value of c that makes the expression be a perfect square trinomial p^2-30p+c
    12·1 answer
  • An equivalent expression to (5x - 3x^2) (5x - 2) • ( 10x + 7x^2) in standard form
    7·1 answer
  • What is the best estimate for 34 times 57
    9·1 answer
  • Is 1/19 a rational number?
    9·2 answers
  • Please help me!
    13·1 answer
  • What is the value of x?<br><br> Enter your answer in the box.
    9·2 answers
  • What is the amplitude of the function?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!