4.496
0.1%
1.7%
0.1%
4.4%
1.79
T
1.5 2 2.5
-4
-3.5...
Mathematics, 05.05.2021 23:20 saja19
4.496
0.1%
1.7%
0.1%
4.4%
1.79
T
1.5 2 2.5
-4
-3.5 -3 -2.5
A car company wants to predict the amount of money people with children are willing to spend to add video entertainment systems to their vehicles.
The company hires a research firm to conduct a random survey and provide predictive statistics. The firm indicates that its sample data reflects a
normal population distribution. On average, the parents surveyed are willing to spend $650 for an entertainment system. The research firm also
reports there are a certain percentage of people likely to spend between $325 and $975, which is within a 1.5 standard deviation (plus or minus) from
the average. What percent of the population falls within this range?
A
50%
B
68%
с
87%
D
93%
Answers: 1
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The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.
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