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
Mrrafil [7]
3 years ago
13

A marble is selected at random from a jar containing 50 red marbles, 30

Mathematics
1 answer:
Nikolay [14]3 years ago
7 0

Answer:

7/10 or 70%

Step-by-step explanation: There is 100 marbles in total and 70 red and green marbles, 70 times out of 100 is the same as 7 times out of 10. Thus, 7/10 or 70%.

You might be interested in
Evaluate the expression
lora16 [44]
The correct answer is B=4
5 0
3 years ago
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 335335 babies were​ born
strojnjashka [21]

Answer:

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

Step-by-step explanation:

Confidence Interval for the proportion:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 335, \pi = \frac{268}{335} = 0.8

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.7437

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.8563

For the percentage:

Multiplying the proportions by 100.

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

7 0
3 years ago
The given line segment has a midpoint at (−1, −2).
Bas_tet [7]

Answer:

The given line segment has a midpoint at (−1, −2).

On a coordinate plane, a line goes through (negative 5, negative 3), (negative 1, negative 2), and (3, negative 1).

What is the equation, in slope-intercept form, of the perpendicular bisector of the given line segment?

y = −4x − 4

y = −4x − 6

y = One-fourthx – 4

y = One-fourthx – 6

y = Three-halvesx + 1

8 0
3 years ago
Read 2 more answers
What is 46,491 rounded to the nearest ten thousand
postnew [5]
50,000 is the nearest ten thousand.
8 0
3 years ago
Read 2 more answers
Which number is equivalent to 4/5?
galben [10]
The answer is D . (0.8)
3 0
3 years ago
Read 2 more answers
Other questions:
  • Which coefficient matrix represents a system of linear equations that has a unique solution?
    15·2 answers
  • which unit of measurement would be the most appropriate to measure the capacity of a bathtub? a : liter b : milliliter c : kilol
    12·1 answer
  • Because of knee problems, Kelly has been warned not to jog more than 15 miles a week. If she jogs three times a week, what is th
    15·2 answers
  • The game of european roulette involves spinning a wheel with 37 slots: 18 red, 18 black, and 1 green. a ball is spun onto the wh
    12·2 answers
  • Math which one is right? Giving brainlist
    6·1 answer
  • All statements of equality below are correct.
    10·2 answers
  • Help me out ? it would help alot
    14·2 answers
  • A triangle has two sides that are 6in and 13in. What could the length of the third side of the triangle be?
    5·1 answer
  • 16−5a+2a−1=41−a<br> what is a?
    13·1 answer
  • for his long distance phone service, lamar pays a 6 dollar monthly fee plus 8 cents per minute. last month, lamars long distance
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!