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
snow_lady [41]
3 years ago
8

The probability that Ariana is on time for a given class is 69 percent. If there are 39 classes during the semester, what is the

best estimate of the number of times out of 39 that Ariana is on time to class
Mathematics
1 answer:
salantis [7]3 years ago
8 0

Answer:

The best estimate of the number of times out of 39 that Ariana is on time to class is 27.

Step-by-step explanation:

For each class, there are only two possible outcomes. Either Ariana is on time, or she is not. The probability of Ariana being on time for a class is independent of other classes. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

E(X) = np

The probability that Ariana is on time for a given class is 69 percent.

This means that p = 0.69

If there are 39 classes during the semester, what is the best estimate of the number of times out of 39 that Ariana is on time to class

This is E(X) when n = 39. So

E(X) = np = 39*0.69 = 26.91

Rounding

The best estimate of the number of times out of 39 that Ariana is on time to class is 27.

You might be interested in
Write an expression that is equivalent to three over four (5z+ 16)
anygoal [31]
     3
------------
4(5z+16)

I'm assuming you want to include all of the numbers
3 0
2 years ago
Read 2 more answers
Find the volume of the cone shown as a decimal rounded to the tenth. 22m 12m
Luda [366]

Answer:

b

Step-by-step explanation:

the volume (V) of a cone is calculated as

V = \frac{1}{3}πr²h ( r is the radius , h is the height )

here diameter = 12 , so r = 12 ÷ 2 = 6 and h = 22 , then

V = \frac{1}{3}π × 6² × 22

   = \frac{1}{3}π × 36 × 22

    = \frac{1}{3}π × 792 ( cancel 3 and 792 by 3 )

    = π × 264

    ≈ 829.4 m³ ( to the nearest tenth )

3 0
2 years ago
What is the correct answer to number 7? Please explain and break it down step by step.
a_sh-v [17]

Answer:

The answer to your question is (x + 3)

Step-by-step explanation:

                    \frac{5x + 5}{x} \frac{x^{3}+ 3x^{2}}{x^{2} - 1} \frac{x - 1}{5x}

Factor the expression

                   \frac{5(x + 1)}{x} \frac{x^{2}(x + 3)}{(x - 1)(x + 1)} \frac{x - 1}{5x}

Simplify

Cancel 5 because is in both numerator and denominator                  

Cancel (x + 1) because is in both numerator and denominator                  

Cancel (x - 1) because is in both numerator and denominator                  

Cancel x² because is in both numerator and denominator              

   

After simplifying, the result is  (x + 3)

6 0
3 years ago
Plz help will mark brainliest if correct answer only ​
statuscvo [17]

Answer:

9. is 3

10. is 1/5

Step-by-step explanation:

use rise/run to find the slope of the graph

7 0
2 years ago
Read 2 more answers
Match each item in Column A to an answer in Column B.
Makovka662 [10]
1) credit Card
2) debit card
3) both
4) credit card (maybe)

Hope it helps!! :)
3 0
2 years ago
Other questions:
  • F(x)=5^x if F(-2) what does this equal
    14·1 answer
  • mr. kork sold his car for 8,400. this was 200 more than two fifths of what he had paid for the car originally
    14·2 answers
  • A movie theater is holding a contest for people who are in line before 10 p.m. The people who are within three places of the 99
    14·1 answer
  • Ccacacvssvvssjdsvshxb de s zzz dat herh
    12·1 answer
  • Which is the exponential form of log3 x= 11?
    13·1 answer
  • Please help me with this. I am really struggling...
    8·1 answer
  • 2xsquared +3x+1=0 solve using quadratic formula
    6·1 answer
  • Help me with my math please
    6·1 answer
  • PLS HELP MEE ASAP 1 MIN LEFT HELPP!!!!!!!!!
    14·1 answer
  • A boat is 10 miles away from a lighthouse that sits on top of a coral reef with a 4 mile radius. At what angle does the captain
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!