The phrase which best describes a period on the periodic table is: a row of elements
Periodic table can be defined as an organized tabular arrangement of all the chemical elements arranged in order of increasing atomic number or number of protons, especially in rows.
On a related note, chemical elements with the same number of valence electrons are found in the same column of the periodic table.
In conclusion, the rows of a periodic table are referred to as periods while the columns are referred to as groups.
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Answer:
the awnser is *use googel or a calculator and find the formula its really easy lean it* <3
Explanation:
Answer:
The probability that it will take a week for it three wet weather on 3 separate days is 0.06166 and its standard deviation is 0.9447
Explanation:
Probability of wet weather = 0.15
Probability of not being a wet weather = 1-0.15
We are supposed to find probability that it will take a week for it three wet weather on 3 separate days
Total number of days in a week = 7
We will use binomial over here
n = 7
p =probability of failure = 0.15
q = probability of success=1-0.15
r=3
Formula :![P(r=3)=^nC_r p^r q ^{n-r}](https://tex.z-dn.net/?f=P%28r%3D3%29%3D%5EnC_r%20p%5Er%20q%20%5E%7Bn-r%7D)
![P(r=3)=^{7}C_{3} (0.15)^3 (1-0.15)^{7-3}\\P(r=3)=\frac{7!}{3!(7-3)!} (0.15)^3 (1-0.15)^{7-3}\\P(r=3)=0.06166](https://tex.z-dn.net/?f=P%28r%3D3%29%3D%5E%7B7%7DC_%7B3%7D%20%280.15%29%5E3%20%281-0.15%29%5E%7B7-3%7D%5C%5CP%28r%3D3%29%3D%5Cfrac%7B7%21%7D%7B3%21%287-3%29%21%7D%20%280.15%29%5E3%20%281-0.15%29%5E%7B7-3%7D%5C%5CP%28r%3D3%29%3D0.06166)
Standard deviation =![\sqrt{n \times p \times q}](https://tex.z-dn.net/?f=%5Csqrt%7Bn%20%5Ctimes%20p%20%5Ctimes%20q%7D)
Standard deviation =![\sqrt{7 \times 0.15 \times (1-0.15)}](https://tex.z-dn.net/?f=%5Csqrt%7B7%20%5Ctimes%200.15%20%5Ctimes%20%281-0.15%29%7D)
Standard deviation =0.9447
Hence The probability that it will take a week for it three wet weather on 3 separate days is 0.06166 and its standard deviation is 0.9447