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Alekssandra [29.7K]
3 years ago
5

Help plz

Mathematics
2 answers:
KATRIN_1 [288]3 years ago
8 0
Number of chickens > 38 because there are more so you use greater than sign
Andrej [43]3 years ago
3 0
A is the awnser because it’s is saying 38 more
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Solve the following system of equations:<br> -2x+y= 1<br> -4x+y= -1
lara31 [8.8K]
The solutions to this equasion are x = 0 and y=1. 
3 0
3 years ago
Read 2 more answers
In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
What is the next number in the pattern 3,12,48,192____? What is the pattern
mina [271]

Answer:

768

Step-by-step explanation:

because they are multiplying times 4

3 0
3 years ago
Jody practiced a piano piece for 500 seconds bill practiced a piano piece for 8 minutes who practiced longer explain
Mrac [35]

Answer:

Jody

Step-by-step explanation:

You can either convert 500 seconds to minutes or 8 minutes to seconds to compare. I'll do both.

There is 60 seconds in a minute. To find the total minutes of 500 seconds, divide 500 by 60 → 8.3, which means that Jody practiced for 8.3 minutes.

To find the total seconds of 8 minutes, multiply 60 seconds per minute by 8 minutes → 60 * 8 = 480 seconds which means that Bill practiced for 480 seconds.

Now you can compare. Jody practiced for 500 seconds, or 8.3 minutes. Bill practiced for 480 seconds, or 8 minutes. Jody practiced longer.

7 0
3 years ago
A company used about 7.4 x 105 sheets of paper in a month. Of the paper used during the month, the accounting department used ab
Rainbow [258]
So (7.4*105)-(8.9*103)   (The sum of all departments)-(The sum of the accounting department) 

(7.4*105)-(8.9*103) = (777)-(916.7) =(-139.7), not sure, did you write the problem wrong? If the total of the company is less than what the account dept used, something is off.  
8 0
4 years ago
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