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Nat2105 [25]
3 years ago
7

Candidates for employment at a city fire department are required to take a written aptitude test. scores on this test are normal

ly distributed with a mean of 280 and a standard deviation of 60. a random sample of nine test scores was taken.
Mathematics
1 answer:
Gnesinka [82]3 years ago
7 0
<span>If a sample of 9 test scores is taken, there is approximately a 68% chance that the scores will be between the scores of 220 and 340, a 95% chance that they will be between 160 and 400 and a 99.7% chance the scores will be between 100 and 460.</span>
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1015
ludmilkaskok [199]

Answer:

A shirt cost £5 while the hat cost £2.

Step-by-step explanation:

What I did was guess and check until i found the amount of each item. You can also use a table to this.

6 0
3 years ago
After 4,000 gallons of water were added to a large water tank that was already filled to 3/4 of its capacity, the tank was then
dangina [55]

Answer:  The correct option is

(E) 80,000.

Step-by-step explanation:  Given that after adding 4,000 gallons of water to a large tank that was already filled to \dfrac{3}{4} of its capacity, the tank was then at \drac{4}{5} of its capacity.

We are to find the number of gallons of water that the tank hold when filled to capacity.

Let the tank can hold x gallons of water when filled to capacity.

Then, according to the given information, we have

\dfrac{3}{4}x+4000=\dfrac{4}{5}x\\\\\\\Rightarrow \dfrac{4}{5}x-\dfrac{3}{4}x=4000\\\\\\\Rightarrow \dfrac{16-15}{20}x=4000\\\\\Rightarrow x=4000\times20\\\\\Rightarrow x=80000.

Thus, the required capacity of the tank is 80,000 gallons of water.

Option (E) is CORRECT.

4 0
3 years ago
The minute hand on a watch is 2.00 cm in length. what is the displacement vector of the tip of the minute hand
olchik [2.2K]
The displacement vector is a vector which gives the point's current position with reference to other points apart from points from the origin. The given length here of the minute hand is the radius and the distance can be written as,
                                       r∠θ
which means that the position can be described by the θ.
3 0
3 years ago
A square classroom has a perimeter of 60 feet. How long is each side of the room?
nignag [31]

Answer:

15

Step-by-step explanation:

since it is a square all sides are equal.

60/4=15

Therefore the answer is 15

4 0
2 years ago
Read 2 more answers
Who knows the answer??
Vanyuwa [196]
14: no she got 69% 38/55 = 69%
8 0
3 years ago
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