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
BartSMP [9]
3 years ago
15

I don't understand :/

Mathematics
1 answer:
Oxana [17]3 years ago
8 0
12.5% because u just divide 50 by 4
You might be interested in
At 10:00 AM Han and Tyler
NARA [144]
Eat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butteat butt
6 0
2 years ago
40% is what number is 82?
Licemer1 [7]
32.8 because.40•82=32.8
8 0
3 years ago
Read 2 more answers
ANSWER QUICK FOR BRAINIEST: When using scientific notation, a positive exponent means . . . the standard number is less than one
Alla [95]

Answer:

The standard number is greater than one. Negative means it's going to be .xxx

6 0
2 years ago
Read 2 more answers
Suppose a research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. A samp
shutvik [7]

Answer:

0.9910 = 99.10% probability that a sample of 170 steady smokers spend between $19 and $21

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 20, standard deviation of 5:

This means that \mu = 20, \sigma = 5

Sample of 170:

This means that n = 170, s = \frac{5}{\sqrt{170}}

What is the probability that a sample of 170 steady smokers spend between $19 and $21?

This is the p-value of Z when X = 21 subtracted by the p-value of Z when X = 19.

X = 21

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

By the Central Limit Theorem

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

Z = \frac{21 - 20}{\frac{5}{\sqrt{170}}}

Z = 2.61

Z = 2.61 has a p-value of 0.9955

X = 19

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

Z = \frac{19 - 20}{\frac{5}{\sqrt{170}}}

Z = -2.61

Z = -2.61 has a p-value of 0.0045

0.9955 - 0.0045 = 0.9910

0.9910 = 99.10% probability that a sample of 170 steady smokers spend between $19 and $21

3 0
3 years ago
Please explain how you got your answer also. A class has 21 girls and 12 boys. What is the probability that a boy's name is draw
Tresset [83]
It’s the answer 12 over 33
3 0
3 years ago
Other questions:
  • A formal garden at the Biltmore Estate has a large, circular fish pool with a 72-foot radius. What is the distance around the ou
    11·1 answer
  • If |x|+10=1, then what does x equal
    12·2 answers
  • 3) The cost of different sizes of orange juice are shown in the table.
    11·2 answers
  • Find the perimeter of the
    6·1 answer
  • find the measure of each angle acute angle in a right triangle where the measure of one acute angle is twice the difference of t
    14·2 answers
  • !!!!I REALLY NEED HELP!!!!!
    10·1 answer
  • Solve for a. -\dfrac14a-4=\dfrac74a-3− 4 1 ​ a−4= 4 7 ​ a−3
    5·2 answers
  • PLEASE HELP NEED!!!!
    12·1 answer
  • What is greater-3/5 or -0.35
    5·2 answers
  • How you write a inequality and then graph the answer?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!