Hi! I need to get this answered right away asap! Waht is 4500, divided by 23400?
2 answers:
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Answer:
Approximately .
Step-by-step explanation:
Remark: this approach make use of the fact that in the original solution, the concentration of and
are equal.
Since is a salt soluble in water. Once in water, it would readily ionize to give
and
ions.
Assume that the and
ions in this solution did not disintegrate at all. The solution would contain:
of
, and
of
from
of
.
Accordingly, the concentration of and
would be:
.
.
In other words, in this buffer solution, the initial concentration of the weak acid is the same as that of its conjugate base,
.
Hence, once in equilibrium, the of this buffer solution would be the same as the
of
.
Calculate the of
from its
:
.
Answer:
The mean number of adults who would have bank savings accounts is 32.
Step-by-step explanation:
For each adult surveyed, there are only two possible outcomes. Either they have bank savings accounts, or they do not. So we use the binomial probability distribution to solve this problem.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
The expected value of the binomial distribution is:
In this problem, we have that:
If we were to survey 50 randomly selected adults, find the mean number of adults who would have bank savings accounts.
This is E(X) when .
So
The mean number of adults who would have bank savings accounts is 32.
We know that the slope of a line is given by:
Proportional relationships lines, rates of change, and slope:
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