Answer:
Variability of data around the mean is best expressed through the standard deviation.
Explanation:
We have some statistical metrics, and we need to find the best measure of the variability of data around the mean.
First variable is mode. Mode of a set of data values is the value that appears most often. It means the most frequent data.
Second variable is Median. The median is a simple measure of central tendency. It is located around 50% of data range.
Third variable is standard deviation. The standard deviation is found by taking the square root of the average of the squared deviations of the values subtracted from their average value. It means, it will show the dispersion of data around the average value.
According to the definition presents for the three variables, Standard deviation is the most appropriate measure of variability of data around the mean.
Can you post the picture of the structure of pyrollium. because my teacher has taught us to determine if it is aromatic cyclic or conjugated by looking at the structure of the molecule.
Electrons(shiwhgsvdjdjwvndkshwgvsbdjdhhagdbdjjshwvwb)
The a<span>tomic mass of helium is 4.002642g/mol </span>
<span>(542000g)/(4.002642g/mol)*6.02*10^23 = 8.15*10^28 atoms
If you don't understand comment, not everyone understands what the / and * mean ^.^</span>
Answer:
Option D. Al is above H on the activity series.
Explanation:
The equation for the reaction is given below:
2Al + 6HBr —> 2AlBr₃ + 3H₂
The activity series gives us a background understanding of the reactivity of elements i.e how elements displace other elements when present in solution.
From the activity series of metals, we understood that metal higher in the series will displace those lower in the series.
Considering the equation given above, Al is higher than H in the activity series. Thus, the reaction will proceed as illustrated by the equation.
Therefore, we can conclude that the reaction will only occur if Al is higher than H in the activity series.