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Marrrta [24]
3 years ago
11

the age in united states has a normal distribution wit a mean 46 years and the standard deviation 13 years .the children are cla

ssified as those younger than 18 years and the middle age citizen are those in the age group 18-55. if a citizen is ramdomly choosen ,what is the probability that he or she is a middle age
Mathematics
1 answer:
mamaluj [8]3 years ago
5 0

Answer:

Step-by-step explanation:1/2

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Find the value of x and y
vova2212 [387]

let's first off take a look at the <u>tickmarks</u>, three <u>side tickmarks</u>, so all those 3 sides are equal, all have a length of y - 25, so is an equilateral triangle.

there are two <u>angle tickmarks</u>, meaning those two angles are equal, wait a second! if those two angles are equal, that means is an isosceles triangle.

now, in an equilateral triangle, all sides are equal, but also all angles are equal, since the sum of all interior angles is 180°, then each angle is really 60°.

let's notice that angle on the upper-left-corner, is a right-angle, but 60° are on the equilateral triangle, and so the remaining 30° must be on the isosceles triangle.

the isosceles triangle has then a vertex of 30°, and twin angles, the twin angles let's say are each a° so then

30° + a° + a° = 180°

30 + 2a = 180

2a = 150

a = 75° = y

now, let's recall, the isosceles triangle has twin angles but it also has twin sides, so the side "x" and the side with the tickmark are equal.

well, we know that y = 75, so the sides with the tickmark are then (75) - 25 = 50 = x.

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3 years ago
Solve the question below
Svet_ta [14]

Answer:

HK

Step-by-step explanation:

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Answer: 90 visitors per hour

Explanation: "Per hour" means in 1 hour, so we can rewrite the given statement using fractions as <em>450 visitors/5 hours = __visitors/1 hour</em>.

To find out what goes in the bank, notice that we

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So we want to find a fraction that is equivalent

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If we divide the numerator and denominator of 450/5 by 5,

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So now we have <em>90 visitors/1 hour = __visitors/1 hour</em>.

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