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kykrilka [37]
2 years ago
11

Please help me. There are 25 students in Mrs. Benatar‘s class at the beginning of the school year, and the average number of sib

lings for each student is three. A new student with eight siblings join the class in November. What is the new class average for number of siblings? Round your answer to the nearest hundredth.

Mathematics
1 answer:
adelina 88 [10]2 years ago
8 0

Answer: 3.19

Step-by-step explanation:

So to find the average I used a simple but pretty effective method

3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+8/26=3.1923

So the new average is 3.19

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Suppose the same quantity is measured but with a more precise method giving an average and standard deviation of 15.0 ± 2.5. how
abruzzese [7]

To solve this, we use the z test.

The formula:

z = (x – u) / s

where x is sample value = 20, u is the mean = 15, and s is the standard deviation = 2.5

z = (20 – 15) / 2.5

z = 2

Since we are looking for values greater than 20, this is right tailed test. We use the standard distribution tables to find for P.

P = 0.0228

 

Therefore:

number of students = 100 * 0.0228 = 2.28

 

<span>2 to 3 students will get greater than 20 measurement</span>

7 0
3 years ago
Round 147.667 &amp; 142.5 to the nearest cent.
Travka [436]

Answer:

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Step-by-step explanation:

Cents are only two digits after the decimal, aka hundredths. So, you have to round each number to the hundredth.

6 0
2 years ago
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2 years ago
15 x 15 x 15 x 15 = 15E The raised letter E stands for an exponent
Pie

Answer:

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7 0
2 years ago
What’s the slope between -14,-10 and 12,18
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