All categories

3 years ago

How to do this question

Mathematics

1 answer:

navik [9.2K]3 years ago

3 0

Answer:

Step-by-step explanation:

by looking at the table, see when f(x)=0.

you can see that when f(x)=0 x=3

You might be interested in

30% of the vehicles in a used car lot are trucks. 10% of the vehicles are green. 3% of the vehicles are green trucks. What is th

Kamila [148]

The answer would be A.) 0.1

7 0

3 years ago

Read 2 more answers

A sample of students from an introductory psychology class were polled regarding the number of hours they spent studying for the

Anni [7]

Answer:

$8.68,13.16$

Step-by-step explanation:

Hint- First we have to calculate the mean and standard deviation of the sample and then applying formula for confidence interval we can get the values.

Mean of the sample is,

$\mu=\dfrac{\sum _{i=1}^{24}a_i}{24}=\dfrac{262}{24}=10.92$

Standard deviation of the sample is,

$\sigma =\sqrt{\dfrac{\sum _{i=1}^{24}\left(x_i-10.92\right)^2}{24-1}}=5.6$

The confidence interval will be,

$=\mu \pm Z\dfrac{\sigma}{\sqrt{n}}$

Here,

Z for 95% confidence interval is 1.96, and n is sample size which is 24.

Putting the values,

$=10.92 \pm 1.96\cdot \dfrac{5.6}{\sqrt{24}}$

$=10.92 \pm 2.24$

$=8.68,13.16$

Confidence interval is used to express the degree of uncertainty associated with a sample.

95% confidence interval means that if we used the same sampling method to select different samples and calculate an interval, we would expect the true population parameter to fall within the interval for 95% of the time.

5 0

3 years ago

Mary Sue and Betty have 603 necklaces altogether. Mary Sue has 115 more necklaces than Betty. How many necklaces does Betty have

Blizzard [7]

Let Mary Sue have m necklaces and Betty have b necklaces.

And they have 603 necklaces altogether, that is

m + b =603

And Mary Sue has 115 more necklaces than Betty, that is

m=b +115

Substituting this value in first equation we will get

b+115+b=603

Subtracting 115

2b= 488

b= 244

So Betty have 244 necklaces .

6 0

4 years ago

Please help!!! 15 points!

scZoUnD [109]

im sorry but i cant seem to open your image?

4 0

3 years ago

HELP FAST PLEASE!!!!!!

Elodia [21]

1. Not random. Because you are asking people if they like ICE CREAM in a ICE CREAM shop.
2. Not random. Because they are serving a small controlled group.
3. Not random. Because you go shopping at Publix because you like it.
4. Random. Because you don't choose who is home or not.

5 0

3 years ago