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3 years ago

PLEASE HELP ASAP

Mathematics

2 answers:

FrozenT [24]3 years ago

8 0

Answer: 80%

Step-by-step explanation:

the person above is correct

Vedmedyk [2.9K]3 years ago

4 0

I got -80.00%I hope this helps

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According to the World Health Organization (WHO) Child Growth Standards, the head circumference for boys at birth is normally di

Elena L [17]

Answer:

$z = \frac{X -\mu}{\sigma}$

This z score tell to us how many deviations we are below or above the mean for a given normal distribution.

For the case of Eddie we got:

$z= \frac{33.2-34.5}{1.3}= -1$

And for the case of Sue we got:

$z = \frac{32.7-33.9}{1.2}= -1$

So then for both cases we see that Eddie and Sue are 1 deviation below the true mean for each gender so then the best conclusion for this case would be:

C.They are the same size relative to other children of the same sex.

Step-by-step explanation:

We can define the random variable X as the head circumference for boys at birth and we know that the distribution for X is given by:

$X\sim N(\mu = 34.5, \sigma=1.3)$

Similarly we can define the random variable Y as the head circumference for boys at birth and we know that the distribution for Y is given by:

$Y\sim N(\mu = 33.9, \sigma=1.2)$

And we know that Eddie was born with 33.2 cm and Sue with 32.7 cm for the head circumference . Since we are interested to determine which child's head circumference is smaller relative to other children of the same sex, we can use the z score formula given by this formula:

$z = \frac{X -\mu}{\sigma}$

This z score tell to us how many deviations we are below or above the mean for a given normal distribution.

For the case of Eddie we got:

$z= \frac{33.2-34.5}{1.3}= -1$

And for the case of Sue we got:

$z = \frac{32.7-33.9}{1.2}= -1$

So then for both cases we see that Eddie and Sue are 1 deviation below the true mean for each gender so then the best conclusion for this case would be:

C.They are the same size relative to other children of the same sex.

5 0

3 years ago

Am I correct? I need help with #4 confused...

Anettt [7]

Answer:

3. 12 airplanes and 6 cars

4. 30 swirled marbles and 22 solid marbles

Step-by-step explanation:

In each case, it is easy enough to check the offered answer to see if it matches problem requirements.

3. You are correct.

4. All answers total 52 marbles, so we need to check to see which has 8 more swirled marbles.

a) 28 more swirled marbles

b) 28 fewer swirled marbles

c) 8 fewer swirled marbles

d) 8 more swirled marbles -- as required by the problem

The correct choice is the last one: 30 swirled marbles; 22 solid marbles.

_____

The first step in solving any problem is to understand what the problem is and what a solution will look like. When the questions are multiple-choice, it is often easier to check the choices than to solve the problem from scratch. Knowing what the solution must look like often lets you eliminate half or more of the answer choices, simplifying the remaining checking.

_____

Both of these are "sum and difference" problems. You are given the total of two items and the difference between them. The generic solution is that the larger quantity is half the sum of the two given numbers.

For 3, this means the number of airplanes (the larger quantity) is half of 18+6=24, so is 12. The number of cars is 6 less than that: 12-6=6.

For 4, this means the number of swirled marbles (the larger quantity) is half of 52+8=60, so is 30. The number of solid marbles is 8 less than that: 30-8=22.

6 0

3 years ago

I'd appreciate someones help !!!

Igoryamba

I think its C sorry if its wrong

4 0

3 years ago

What is undefined in functions

Andrew [12]

A function is said to be "undefined" at points outside of its domain.

4 0

3 years ago

What is the secant of negative (sqrt 3)/2

77julia77 [94]

The answer your looking for is (-3.11416778437). I added all of the numbers incase you had to round off to the thoussandths or millionths.
Hope it helps.

3 0

3 years ago