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
natali 33 [55]
3 years ago
9

Suppose that only 65% of all drivers in a certain state wear a seat belt. a random sample of 80 drivers is selected. what is the

probability that more than forty-two drivers wear a seat belt?
Mathematics
1 answer:
jonny [76]3 years ago
7 0

Answer:

Pr(X >42) = Pr( Z > -2.344)

                = Pr( Z< 2.344) = 0.9905

Step-by-step explanation:

The scenario presented can be modeled by a binomial model;

The probability of success is, p = 0.65

There are n = 80 independent trials

Let X denote the number of drivers that wear a seat belt, then we are to find the probability that X is greater than 42;

Pr(X > 42)

In this case we can use the normal approximation to the binomial model;

mu = n*p = 80(0.65) = 52

sigma^2 = n*p*(1-p) = 18.2

Pr(X >42) = Pr( Z > -2.344)

                = Pr( Z< 2.344) = 0.9905

You might be interested in
If p is a positive integer,then p(p+1)(p-1) is always divisible by?
ElenaW [278]

I am not quite sure what the choices are, but the answer to that problem is:

If p is a positive integer, then p(p+1)(p-1) is always divisible by “an even number”.

The explanation to this is that whatever number you input to that equation, the answer will always be an even number. This is due to the expression p(p+1)(p-1) which always result in a even product.

For example if p=3, then (p+1)(p-1) becomes (4)(2) giving you a even number.

And if for example if p=2, then (p+1)(p-1) becomes (3)(1) which gives an odd product, but we still have to multiply this with p therefore 2*3 = 6 which is even product. The outcome is always even number.

<span>Answer: From the choices, select the even number</span>

4 0
3 years ago
Compare Decima<br> 2.48 [. ] 2.53<br><br> I need help finishing if this is a &lt;,&gt; or =
lorasvet [3.4K]

Answer: <

Step-by-step explanation:

2.48 < 2.53

7 0
3 years ago
Based on the picture below. find the angle measure for lmn.
trasher [3.6K]

Answer:

Step-by-step explanation:

4x + 2x = 90

6x = 90

x = 15

4(15)= 60 for <LMN

2(15)= 30

5 0
3 years ago
Lacy walks 3 miles in one hour. how many feet does Lacy walk in 30 minutes
lapo4ka [179]
I believe the answer is 7920 feet.
8 0
3 years ago
What elephant's weight is 2.85 tons when rounding to the nearest hundredth?
Gwar [14]

Answer:

D. Fanny: 2.849

Step-by-step explanation:

It is D because the 4 is in the hundreds place and the 8 is to the left to it and it is 5 and above so the means you round it to 2.85.

6 0
3 years ago
Other questions:
  • How many of possible outcomes could be a number biggger than 6 on either cube
    12·1 answer
  • Fitness Explosion charges $26 per month for a membership. Fitquest charges $15 per month plus a $55 initiation fee for membershi
    15·1 answer
  • How is adding 2.67+8.91 similar to adding 8.91 +2.67
    5·1 answer
  • A soda machine takes 3 seconds to fill a 15-ounce cup. If t represents the time in seconds, which equation can you use to find h
    11·2 answers
  • Marathon Hours,Miles 0,0; 1,6; 2,11; 3,15; 4,21; 5,26.2. Cayla ran a marathon. The table shows which mile Cayla had finished at
    14·2 answers
  • Help please T-T worth 10 pts. ​
    12·2 answers
  • I am so confused can someone please help me :)
    11·2 answers
  • Solve for y, i'll give brainiest. i need help. please
    6·1 answer
  • Describing the square root of 0.6 which is less than one
    15·1 answer
  • A bag of marbles contains 3 blue marbles, 2 green marbles and 5 red marbles. A marble is chosen at random. The probability that
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!