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4 years ago

WILL MARK BRAINLEIST!!!!! HELP ASAP!

Mathematics

2 answers:

Dvinal [7]4 years ago

7 0

The correct answer is 1 7/5

Alex Ar [27]4 years ago

5 0

Answer:

1 7/5

Step-by-step explanation:

we should first simplify the fraction part of each option

7/5 = 1 2.5 add this to 1 and you get 2 2/5

this happens to be the answer but in the future go through each option

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The first Portuguese explorer to lay claim to Brazil was

Serhud [2]

Answer:

Cabral is right

Step-by-step explanation:

Mark me brainleyest plz

6 0

3 years ago

According to a study conducted by the Gallup Organization, the the proportion of Americans who are afraid to fly is 0.10. A rand

notsponge [240]

Answer: 0.1457

Step-by-step explanation:

Let p be the population proportion.

Given: The proportion of Americans who are afraid to fly is 0.10.

i.e. p= 0.10

Sample size : n= 1100

Sample proportion of Americans who are afraid to fly = $\hat{p}=\dfrac{121}{1100}=0.11$

We assume that the population is normally distributed

Now, the probability that the sample proportion is more than 0.11:

$P(\hat{p}>0.11)=P(\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}>\dfrac{0.11-0.10}{\sqrt{\dfrac{0.10(0.90)}{1100}}})\\\\=P(z>\dfrac{0.01}{0.0090453})\ \ \ [\because z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}} ]\\\\=P(z>1.1055)\\\\=1-P(z\leq1.055)\\\\=1-0.8543=0.1457\ \ \ [\text{using z-table}]$

Hence, the probability that the sample proportion is more than 0.11 = 0.1457

3 0

3 years ago

Find the modulus of -2 - 6i. 40 -40 6.3 -6.3

olga2289 [7]

The modulus of complex number can be computed with this equation:
|z|=sqrt(Re(z)^2+Im(z)^2)
z = -2-6i
Re(z)=-2, so Re(z)^2=4
Im(z)=-6, so Im(z)^2=36
|z|=sqrt(36+4)=sqrt(40)=6.3

6 0

3 years ago

If the variance is 81 grams, what is the standard deviation four times?

Svetlanka [38]

Answer:

102

Step-by-step explanation:

i guess

6 0

3 years ago

Harold spent 3/4 hour milked 3 groups of cows. If he spent an equal amount of time on each group of cows, what fraction of an ho

torisob [31]

1/4 hour because since it took him 3/4 hr to milk 3 groups, it is reasonable to divide 3/4 by 3. So in 1/4 hour.

3 0

4 years ago