Alisha bought a collection of 500 old pennies. she chose 20 pennies from the collection and recorded their dates. seven pennies
2 answers:
Answer: The best estimate of the percentage is 35%.
Step-by-step explanation: Given that Alisha bought a collection of 500 old pennies. She chose 20 pennies from the collection, recorded their dates and note that seven pennies had dates earlier than 1980.
We are to find the best estimate of the percent of pennies in Alisha's collection that have dates earlier than 1980.
Since, 7 out of 20 pennies from the collection had dates earlier than 1980.
So, the percentage of of pennies in Alisha's collection that have dates earlier than 1980 will be
Thus, the best estimate of the percentage is 35%.
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Answer:
a)
b) The population increases 7.1% each year.
Step-by-step explanation:
The continuous population growth model is given by:
In which is the population after t years,
is the initial population and r is the growth rate.
In this problem, we have that:
A population grows from its initial levelof 22,000 at a continuous growth rcte of 7.1% per year.
This means that
a) Write a function to model the population increase.
b) By what percent does the populaiion increase each year?
So the population increases 7.1% each year.