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Zinaida [17]
3 years ago
8

There are 3 boys to every 5 girls in a class. The class has 64 students. How many boys are there

Mathematics
1 answer:
Elena L [17]3 years ago
6 0
The answer is 24 boys and 40 girls
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PLEASE HELP This is solving Exponential and Logarithmic Equations I got the other ones, but I don’t even know what this says to
QveST [7]

Answer:

Step-by-step explanation:

We have

e^\frac{x}{2}^l^n^3 = 5\\

ln(e^\frac{x}{2}^l^n^3) = ln(5)\\\frac{x}{2}ln(3) = ln(5)\\\frac{x}{2} = \frac{ln(5)}{ln(3)}    \\x = \frac{2ln(5)}{ln(3)}

x = 2.929947041

to the third decimal is 2.930 (i might be wrong on the rounding part)

7 0
3 years ago
What is 4y×2 when is y=2​
nikitadnepr [17]

Answer:

16

Step-by-step explanation:

4x2=8

8x2=16

7 0
3 years ago
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period
Sergio [31]

Answer:

a. μ = 25

b. σ = 16.496

Step-by-step explanation:

Note: See the attached excel for the calculation of Mean and Deviation from Mean.

Let: N = Number of observation = 9

F = Frequency

Therefore, we have:

a. Compute the expected number of arrivals per minute. μ=___( please type as an integer or a decimal)

From the attached excel file, we have:

Total F = 200

Therefore, we have:

μ = Mean = Total of F / (N - 1) = 200 / (9 - 1) = 25

b. Compute the standard deviation σ=___(please round to three decimal places as needed)

From the attached excel file, we have:

Total (F -  μ)^2 = 2,177

σ = Standard deviation = (Total of (F -  μ)^2 / (N - 1))^0.5 = (2,177 / (9 - 1))^0.5 = 16.496

Download xlsx
7 0
3 years ago
14.<br> What is the solution set for -4 x - 10 ≤ 2?
SOVA2 [1]

Answer:

x<=(less or equal to) 1/20

Step-by-step explanation:

5 0
3 years ago
A group of veterinary researchers plan a study to estimate the average number of enteroliths in horses suffering from them. Prev
ycow [4]

Answer:

1.) 107 observations

2.) the best veterinary hospital is likely to see the most severe cases with larger number of enteroliths

3.) A. sample size is too small for the central limit theorem to apply.

4.) The test requires that the sample mean is normally distributed; this requires that either the population distribution is Normal or the sample size exceeds 30.

5.) a Type I error

Step-by-step explanation:

n = [(Zcritical * σ) ÷ E]²

n = sample size

Zcritical at 99% = 2.58

E = error margin = 0.5

Standard deviation, σ = 2

n = [(2.58 * 2) ÷ 0.5]²

n = [5.16 ÷ 0.5]²

n = (10.32)²

n = 106.5024

n = 107 observations

B.) The thought or decision that the best veterinary hospital is likely to see the most severe cases with larger number of enteroliths will introduce a bias in the study.

C.) For central limit theorem ; sample size must be considerably large ; at least sample size, n ≥ 30

D.) Distribution must be normal it approximately normal, obeying the central limit theorem ; sample size must be considerably large ; at least sample size, n ≥ 30

5 0
3 years ago
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