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
adelina 88 [10]
2 years ago
15

How many ways can 4 student ma be chosen from a class of 30 students is ?

Mathematics
2 answers:
snow_tiger [21]2 years ago
6 0
If the order doesn't matter then you have to apply the combination formula:

³⁰C₄ = (30!)/(4!)(30-4)! = 27,405 WAYS

andre [41]2 years ago
3 0
That's we can solve by using a combination algorithm: C^4_{30}=\frac{30*29*28*27}{4*3*2*1} = 27405
You might be interested in
1. Sum of two numbers = 15
lions [1.4K]
The answer is 45 because you multiply 9 and 6
5 0
3 years ago
Read 2 more answers
The coordinates of trapezoid ABCD are A(−4, 3), B(2, 3), C(4, −1) and D(−4, −1). A line segment runs through the trapezoid with
madam [21]
The distance from point Y to the y-axis is 4 units and the distance from point Z to the y-axis is 3 units, then the lelgth of the segment YZ is 4+3=7 units.
If <span>a scale factor is 3, then the length of Y'Z' will be 7·3=21 units.
</span>
P.S. In the added picture you can see trapezoid ABCD that was dilated by a scale factor 3 about the origin. This may help to understand that all linear values after dilation become multiplied by scale factor.
<span> </span>

5 0
3 years ago
Read 2 more answers
The operation manager at a tire manufacturing company believes that the mean mileage of a tire is 48,564 miles, with a standard
DerKrebs [107]

Answer:

0.0091 = 0.91% probability that the sample mean would be less than 48,101 miles in a sample of 281 tires if the manager is correct

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 normally distributed 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.

Central limit theorem:

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, the sample means with size n of at least 30 can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}

In this problem, we have that:

\mu = 48564, \sigma = 3293, n = 281, s = \frac{3293}{\sqrt{281}} = 196.44

What is the probability that the sample mean would be less than 48,101 miles in a sample of 281 tires if the manager is correct?

This is the pvalue of Z when X = 48101. So

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

By the Central Limit Theorem

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

Z = \frac{48101 - 48564}{196.44}

Z = -2.36

Z = -2.36 has a pvalue of 0.0091

0.0091 = 0.91% probability that the sample mean would be less than 48,101 miles in a sample of 281 tires if the manager is correct

6 0
2 years ago
Which table represents a situation with a rate of change of 5
Reil [10]

Answer:

You need to add a picture so we can help

6 0
2 years ago
The first term of an arithmetic sequence is -5, and the tenth term is 13. Find the common difference.
zzz [600]
Hello,

u_{1} =-5\\&#10; u_{2} =-5+d\\&#10; u_{3} =-5+2d\\&#10; u_{4} =-5+3d\\&#10;...\\&#10; u_{10} =-5+9d=13\\&#10;==\ \textgreater \  9d=18 \\&#10;==\ \textgreater \  d=2&#10;&#10;
6 0
3 years ago
Other questions:
  • 1/3(5x-15+4x)=1+3×+4
    9·2 answers
  • 3x^2(y+5)+7(y+5) in complete factor form
    13·1 answer
  • Meagan worked 24 hours and earned $84 what is her rate pay
    14·2 answers
  • A scale model of the titanic is 107.5 inches long and 12.25 inches wide. The titanic itself was 882.75 feet long. How wide was i
    9·1 answer
  • Y= negative 2/3 graph it
    14·1 answer
  • What is the answer to 2x+50
    15·2 answers
  • Please help me!!!!!!
    7·1 answer
  • Fill in each box with the correct number or variable.
    13·1 answer
  • What is 25x2+8/5x21<br><br> Exact number no rounding
    15·1 answer
  • Solve the equation <br>4(2^m+1)-16^m=0​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!