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
Sladkaya [172]
3 years ago
7

Question 11 options: the lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation

of 15 days. what is the probability that a pregnancy lasts at least 300 days?
Mathematics
1 answer:
Ber [7]3 years ago
3 0
Think of (or draw) a standard normal curve with mean 268 days and std dev 15 days.

Calculate the z-score for 300 days:

       300-268          32
z = -------------- = --------- = 2.13
           15                15

Now find the area under the curve to the right of z = + 2.13.  Alternatively, find the area under the curve to the left of this z and subtract the result from 1.00.

I used my TI-83's DISTR function normalcdf( to calculate the area to the right of 300 days:

normalcdf(300,infinity, 268, 15) = 0.016, or about 0.02.

Only about 2% of pregnancies will last 300 days or longer.
You might be interested in
Write equations as sentence. x-14=9​
Blababa [14]

Answer:

5 (wait i screwed up) its 23

Step-by-step explanation:

3 0
3 years ago
For sample sizes greater than 40, the results of hypothesis tests and confidence intervals using the t distribution are highly s
dem82 [27]
We' supposed to indicate which statement is true/false.

Note that, if a sample size is 40 or over, we can use the t distribution even with skewed data. So it's not highly sensitive to non-normality of the population from which samples are taken. So statement A is false. 

It's true that the t-distribution assumes that the population from which samples are drawn is normally distributed. So B is true.

For skewed data or with extreme outliers, we can't use the t distribution. We only use t distribution as long as we believe that the population from which samples are drawn is closed to a bell-shape. So C is true.

 Lastly, statement D is against statement C. So D is false.




 
5 0
3 years ago
Read 2 more answers
What is the equation of a line with a x-intercept of −2 and a y-intercept of 10?
IceJOKER [234]

Hey there! :)

Answer:

y = 5x + 10

Step-by-step explanation:

From the information given, we can derive the points (-2, 0) and (0, 10). Find the slope using the slope formula:

m = \frac{\text{rise}}{\text{run}} = \frac{y_2 - y_1}{x_2 - x_1}

Plug in the points:

m= \frac{10 - 0}{0 - (-2)}

Simplify:

m= \frac{10}{2}

m = 5.

The equation in slope-intercept form is y = mx + b. We were already given the b value, or y-intercept as y = 10. Therefore:

y = 5x + 10 is the equation written in slope-intercept form.

8 0
2 years ago
Read 2 more answers
The quotient of 794.1 divided by 7.61, expressed to two decimal places, is A. 104.35. B. 95.83. C. 786.49. D. 1,043.50.
AysviL [449]
<span>The question asks us to find the quotient of 794.1 by 7.61, expressed to two decimal places. First we will divide those two numbers: 794.1 : 7.61 = 104.34954. Then we have to round the result to the 2 decimal places. After 104.34 is 9 so we have to round the number to 104.35. Answer: The quotient is 104.35.</span>
3 0
3 years ago
AC =<br> Round your answer to the nearest hundredth.<br> 5<br> ?<br> 35<br> B
Bingel [31]

Answer:2.87

Step-by-step explanation:sin =opp/hyp

Sin 35=ac/5

Cross multiply

Sin 35 x 5 = ac

0.5736 x 5 =ac

2.868=ac

Ac=2.87

3 0
2 years ago
Other questions:
  • Which statement is true about the difference 2√7-√28
    14·1 answer
  • Find a value of 21 + 4(3^2 -5)
    15·1 answer
  • How does a digit in the ten thousands place to a digit in the thousand place?
    7·2 answers
  • Please answer this question with reason please​
    14·1 answer
  • You are a space alien. You visit planet Earth and abduct 979797 chickens, 474747 cows, and 777777 humans. Then, you randomly sel
    6·2 answers
  • How many three eight inch thick books makes stack that is 6 inches tall​
    12·1 answer
  • Can someone plz help me with this. i need it tomorrow.
    15·1 answer
  • 7/8 divided by 1/16 in simplest form?
    12·2 answers
  • PLEASE HELP ME WITH THIS
    6·2 answers
  • Solve the system with elimination.3x + y = 9x + 2y = 3
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!