A culture of yeast doubles in size every four hours. If the yeast population is estimated to be three million now, what will it
2 answers:
Answer: B. 192,000,000
Step-by-step explanation:
The exponential growth functions in time period x is given by :-
, where A is the initial amount , b is the growth factor.
Given: Growth factor :
Initial population :
Time period to double in size = 4 hours
The the total number of time period in a day :
[∵A day = 24 hours]
Then , The population of yeast after 1 day ill be :-
Hence, the population of yeast after 1 day =192,000,000
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It's a combination:
Answer:
Number of families that should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5 is at least 43.
Step-by-step explanation:
We are given that one wants to estimate the mean PSLT for the population of all families in New York City with gross incomes in the range $35.000 to $40.000.
If sigma equals 2.0, we have to find that how many families should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5.
Here, we will use the concept of Margin of error as the statement "true mean PSLT within 0.5" represents the margin of error we want.
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<u>SO, Margin of error formula is given by;</u>
Margin of error =
where, = significance level = 10%
= standard deviation = 2.0
n = number of families
Now, in the z table the critical value of x at 5% ( ) level of significance is 1.645.
SO, Margin of error =
0.5 =
n =
= 43.3 ≈ 43
Therefore, number of families that should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5 is at least 43.