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Anika [276]
3 years ago
11

2. Twenty-four fourth graders are going on a field trip to the Academy of Science. They need to form 3 groups of students for th

e tour guides. How many students will be in each group? Show how you found your answer. ​
Mathematics
1 answer:
STatiana [176]3 years ago
5 0
8 students in each group
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Select a solution for:<br> x^2=81/144
Brilliant_brown [7]

Answer:

x=3/4, -3/4

Step-by-step explanation:

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If you broke apart 56 in half, What plus what would you get?
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28 + 28 = 56

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3 years ago
Use the drop-down menus to describe the key aspects of the function f(x) = –x2 – 2x – 1.
Margaret [11]

Answer: The vertex is the minimum value

The function is increasing when x<1

The function is decreasing when x>1

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Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
An educational psychologist wishes to know the mean number of words a third grader can read per minute.
Rama09 [41]

Answer: 208.

Step-by-step explanation:

The formula to find the minimum sample size is given by :-

n= (\dfrac{z^*\times \sigma}{E})^2                                    (1)

, where z* = critical z-value (two tailed).                                                                      

\sigma = Standard deviation ( from prior study ) and E = Margin of error.

As per given , we have

Margin of error : E= 0.29

Confidence level = 85%

Significance level =\alpha=1-0.85=0.15

Using z-table , the critical value (two -tailed)=z^*=z_{\alpha/2}=z_{0.15/2}=z_{0.075}=1.439

As per previous study , Variance =\sigma^2=8.41

\sigma=\sqrt{8.41}=2.9

Now, the required minimum sample size = n= (\dfrac{(1.439)\times (2.9)}{0.29})^2   [Substitute the values in formula (1)]

n=(14.39)^2

n=207.0721\approx208  [ Round to the next integer]

Hence, the minimum number of third graders that must be included in a sample = 208.

5 0
3 years ago
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