Nanci is volunteering at the animal shelter she wants to spend an equal amount of time with each dog she has 145 minutes to play
1 answer:
Answer:
It takes 20 minutes for each dog
Step-by-step explanation:
she wants to spend an equal amount of time with each dog she has 145 minutes to play with all 7 dogs
It takes 145 minutes to play with 7 dogs
for 7 dogs it takes 145 minutes
To find the time taken for 1 dog , divide 145 by 7
It takes 20 minutes for each dog
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Answer:
0.8224
Step-by-step explanation:
Data
- mean: $76
- standard deviation, sd: $10
- first value of interest, x1: $63
- second value of interest, x2: $90
z-score for x1:
z1 = (x1 - mean)/sd = (63 - 76)/10 = -1.3
z-score for x2:
z2 = (x2 - mean)/sd = (90 - 76)/10 = 1.4
The proportion of wrist watch prices are between $63 and $90 is:
P(z1 < z < z2) = P(z < 1.4) - P(z < -1.3)
P(z < 1.4) = 0.9192 (see first picture attached)
P(z < -1.3) = 0.0968 (see second picture attached)
P(z1 < z < z2) = 0.9192 - 0.0968 = 0.8224
If is the amount of strontium-90 present in the area in year
, and it decays at a rate of 2.5% per year, then
Let be the starting amount immediately after the nuclear reactor explodes. Then
or simply
So that after 50 years, the amount of strontium-90 that remains is approximately
or about 28% of the original amount.
We can confirm this another way; recall the exponential decay formula,
where is measured in years. We're told that 2.5% of the starting amount
decays after 1 year, so that
Then after 50 years, we have