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svlad2 [7]
3 years ago
15

Please explain step by step for 0.67÷0.3=?

Mathematics
1 answer:
pentagon [3]3 years ago
3 0
Multiply each of the numbers by a ten to a power that they both become whole numbers.

0.67 * 10^2 = 67
0.3 * 10^2 = 30

Divide as usual.

67 / 30 = 2 \frac{1}{3}

So, the answer is 2 1/3.
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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
Jamal has $35 to spend at the mall. If pairs of shorts are $9.99, how many can he buy?
Mrac [35]

$35 / $9.99 = 3.5 pairs of shorts

We have to round down because you cannot buy half a pair of shorts

The correct answer is 3 pairs of shorts.

5 0
3 years ago
Read 2 more answers
How do I do this? I need help!
Galina-37 [17]
Y=12
x=6

The triangle is a 30-60-90 triangle!
3 0
3 years ago
(1, 7); slope = -1 please help fast
Harrizon [31]

Answer:

y = - x + 8

Step-by-step explanation:

Step 1:

y = mx + b     Slope Intercept Form

Step 2:

y = -x + b     Input Slope

Step 3:

7 = - 1 ( 1 ) + b    Input x and y

Step 4:

7 = - 1 + b      Multiply

Step 5:

b = 8     Add 1 on both sides

Answer:

y = - x + 8

Hope This Helps :)

7 0
3 years ago
Read 2 more answers
How do you do this??<br> 14cents/oz = $__/Ib<br> ????????????????
yarga [219]

Answer:

$2.24 / lb

Step-by-step explanation:

$1 = 100 cents

16 oz = 1 lb

14 cents/oz *\frac{1 dollar}{100 cents}*\frac{16oz}{1lb}

Simplified,

\frac{14 *16}{100}

\frac{224}{100} = $2.24/ lb

6 0
3 years ago
Read 2 more answers
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