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3 years ago

A huming bird waves its feathers 53 times per second about how many times does it beat for 5 seconds

Mathematics

1 answer:

svlad2 [7]3 years ago

5 0

265 times in 5 seconds

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A survey among freshman at a certain university revealed that the number of hours spent studying before final exams was normally

patriot [66]

Answer: 0.0775

Step-by-step explanation:

Given : Mean : $\mu = 25$

Standard deviation : $\sigma =15$

Sample size : $n=36$

Since its normal distribution , then the formula to calculate the z-score is given by :-

$z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

For x= 28.2 hours

$z=\dfrac{28.2-25}{\dfrac{15}{\sqrt{36}}}=1.28$

For x= 30 hours

$z=\dfrac{30-25}{\dfrac{15}{\sqrt{36}}}=2$

The P- value = $P(1.28$

$=P(z$

Hence, the probabiliy that the average time spent stydying for the sampe was between 28.2 and 30 hours = 0.0775

6 0

3 years ago

a plumber charges a service call fee of $25 plus $40 for each hour she works. which variable is the independent variable?

Viktor [21]

I think I'd be the $40 she charges every hour she works. If this is multiple choice mind drop-in the options

4 0

3 years ago

Read 2 more answers

Anybody willing to help?

alexandr402 [8]

Answer:

16 is H.9

17. is A.9

Step-by-step explanation:

Hope it helped! ^_^

6 0

3 years ago

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4.

Lilit [14]

The answer is A) 3.
I hope this helps.

7 0

3 years ago

Read 2 more answers

I need help pls help me

lutik1710 [3]

First Method:

Round $\frac{3}{5}$ to the closest integer, which is 1.

Round $\frac{3}{4}$ to the closest integer, which is also 1.

So 1 + 1 = 2.

Answer for method 1: 2

Second Method:

$\frac{3}{5}$ + $\frac{3}{4}$ = $\frac{3*4}{5*4} + \frac{3*5}{4*5} = \frac{12}{20}+\frac{15}{20}=\frac{27}{20}$

$\frac{27}{20}$ is around 1

Answer for method 2: 1

The closest answer is 1.

3 0

2 years ago