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
Pepsi [2]
3 years ago
9

The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.

Mathematics
1 answer:
Zarrin [17]3 years ago
8 0
Let the lengths of pregnancies be X
X follows normal distribution with mean 268 and standard deviation 15 days
z=(X-269)/15

a. P(X>308)
z=(308-269)/15=2.6
thus:
P(X>308)=P(z>2.6)
=1-0.995
=0.005

b] Given that if the length of pregnancy is in lowest is 44%, then the baby is premature. We need to find the length that separates the premature babies from those who are not premature.
P(X<x)=0.44
P(Z<z)=0.44
z=-0.15
thus the value of x will be found as follows:
-0.05=(x-269)/15
-0.05(15)=x-269
-0.75=x-269
x=-0.75+269
x=268.78
The length that separates premature babies from those who are not premature is 268.78 days
You might be interested in
Simplify 4^2 * 4^8= A.)4^16 B.)4^10 C.)16^16 D.)16^10 please help me i need this asap.
SVEN [57.7K]

Answer:

4^{10}

Step-by-step explanation:

Complete the exponents first.

4*4=16

4*4*4*4*4*4*4*4=65536

65536 *16= 1048576

The answer is 4^{10}

You can also find this if you add the exponents.

6 0
3 years ago
-7 a rational or irrational number
kogti [31]
Irrational number
There is a chart on goggle
6 0
3 years ago
An unfair coin with​ Pr[H] = 0.75 is flipped. If the flip results in a​ head, a student is selected at random from a class of si
Agata [3.3K]

Answer:

72.73% probability of selecting a​ girl, given the flip resulted in​heads

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

Coin resulted in heads

Student is selected at random from a class of six boys and sixteen girls.​

Desired outcomes:

16 girls, so D = 16

Total outcomes:

16+6 = 22, that is, 22 students, so T = 22

Probability:

P = \frac{16}{22} = 0.7273

72.73% probability of selecting a​ girl, given the flip resulted in​heads

7 0
3 years ago
It takes 0.5 gallon of cream to make 1 pound of butter.
worty [1.4K]

Answer:

0.5 pounds of butter.

Explanation

X pounds for 0.25 gallons.

0.5 gallon of cream - 1 pound of butter

0.25 gallons of cream - X pounds of butter

Applying cross multiplication:

0.5X = 0.25

X = 0.25 over 0.5 or 0.25/0.5

X = 0.5

Therefor, you could make 0.5 pounds of butter with 0.25 gallons of cream.

7 0
2 years ago
Please solve this equation fast
omeli [17]

Answer:under is answer

Step-by-step explanation:

5/8+3/4=11/8 then,-2/3-5/6=-3/2

6 0
2 years ago
Other questions:
  • A group of five friends are sharing 2 pounds of trail mix write a division problem and a fraction to represent this problem
    7·1 answer
  • If $17,000 is invested in an account for 25 years. Calculate the total interest earned at the end of 25 years if the interest is
    6·1 answer
  • When three is added to four times a number, the result is 15
    7·1 answer
  • PLZ HELP ASAP I’ll NAME YOU BRAINLIEST + 20 POINTS
    6·1 answer
  • Use an area model to solve. 1 3/4 X 2 1/2
    13·1 answer
  • Break the dividend into smaller parts that are easier to divide write the equivalent name you used.
    7·1 answer
  • X =4<br> x+y=-6<br> 4x - 3y + 2z = 26
    6·1 answer
  • What is the expressions factor for -12x+24-18y?
    15·2 answers
  • What is the answer please help no links
    8·1 answer
  • Write a different expression that has the same quotient as (−3)/8 and −(3/8) .
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!