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Rus_ich [418]
3 years ago
11

The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years

for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard deviation of 12.7 years. Of the 82 nonwhites, the mean life span was 34.1 years with a standard deviation of 15.6 years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites.
Mathematics
1 answer:
faust18 [17]3 years ago
6 0

Answer:

A local maximum of the function f(x) occurs when x =

Step-by-step explanation:

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A life guard in a tower 20 ft above sea level spots a struggling surfer at an angle of depression of 15 . How far is the surfer
GalinKa [24]

Answer: 19.31\ ft

Step-by-step explanation:

Given

The tower is at a height of h=20\ ft

the angle of depression is 15^{\circ}

Suppose the surfer is x ft away from the base of the tower

\therefore \text{From the figure, we can write}\\\\\Rightarrow \cos 15^{\circ}=\dfrac{x}{h}\\\\\Rightarrow x=h\cos 15^{\circ}\\\Rightarrow x=20\cos 15^{\circ}\\\Rightarrow x=19.31\ ft

Therefore, the surfer is at a distance of 19.31 ft from the base of the tower.

7 0
3 years ago
PLZ HEEEEEEEELPPPPPPPP!!!!!!!!!
Elena L [17]
Y= ∛(-x) - 3
for x = -8 → y = ∛-(-8) - 3 ↔ y = 2-3 ↔y = -1
for x= 8 → y= ∛(-8) - 3 ↔ y = -2 -3 ↔ y = -5
Then  - 5≤ y≤ - 1
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5 0
3 years ago
What is the standard Form of y+1/5=3x
miss Akunina [59]

Answer:

y=3x-1/5

Step-by-step explanation:

we have to move 1/5 to the other side

5 0
4 years ago
Hurry plsssss math test
liraira [26]

Answer:60

90-30=60

Step-by-step explanation:

4 0
3 years ago
You’re assembling desserts with a friend. Together you can make 12 desserts in 5 minutes. How many can you make in 20 minutes?
finlep [7]

Answer:

You both together can make 48 desserts in 20 minutes.

Step-by-step explanation:

It is a proportion.

5 minutes = 12 desserts

20 minutes = x desserts

Now let's form a proportion and find the value of "x"

5/20 = 12/ x

Cross multiplying, we get

5x = 240

Dividing both sides by 5, we get

x = 240/5

x = 48

You together can make 48 desserts in 20 minutes.

Hope this will helpful.

Thank you.

4 0
4 years ago
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