Assume that when adults with smartphones are randomly selected, 58% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that at least 2 of them use their
smartphones in meetings or classes.
The probability is
(Round to four decimal places as needed.),

Step-by-step explanation:

The number of adults that use smartphones in meetings or classes follows a binomial distribution. So, the probability that x adults use their  smartphones in meetings or classes is calculated as:

Where, n is the number of identical and independents events, in this case, 7 adults with smartphones. p is the probability of success or the probability that the adult use the smartphone in meeting or classes, in this case, p is equal to 0.58

So, replacing values, we get that the probability that x adults use their  smartphones in meetings or classes is:

Now, the probability that at least 2 of them use their  smartphones in meetings or classes is calculated as:

Where:

Finally, is equal to:

table 3 represents a direct variation function. : )

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.