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vovikov84 [41]
3 years ago
9

7.Solve the following system of equations:

Mathematics
1 answer:
Nadusha1986 [10]3 years ago
5 0
The answer whould be c or b but I can be a it’s o o o I know it is A
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Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age with a mean of 93 seconds and
Luda [366]

Answer:

C. 45 and 141 seconds

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 93 seconds

Standard deviation = 16 seconds

99.7% of running times are approximately between:

By the Empirical rule, within 3 standard deviations of the mean, so between 3 standard deviations below the mean and 3 standard deviations above the mean

3 stnadard deviations below the mean

93 - 3*16 = 45 seconds

3 standard deviations above the mean

93 + 3*16 = 141 seconds

The correct answer is:

C. 45 and 141 seconds

3 0
3 years ago
HELP TIMED BRAINLIST
lesya692 [45]

Answer:

it's D

Step-by-step explanation:

You use distribute property, then add all like terms

3 0
3 years ago
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Solve 5x + 12 = x -4
sergey [27]
The Answer Is =4 :) Hope it Helps
7 0
3 years ago
If you have two pennies, the probability of both coming up heads when flipped is _____.
Juli2301 [7.4K]
There are four side to 2 pennies 
both (2) coming up head out all the side (4)
there is a 2/4 chance then simplify by dividing by 2/2 and get ½
so you have ½ chance of both becoming heads

Hope this helps :D
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3 years ago
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Use the arc length formula and the given information to find r. Show your work for full credit. s = 8.1 ft θ = (3.14/3)rad r = ?
VladimirAG [237]
This question is simple I'm a little confused on the specifics so I will try my best to help.

s=θ(r)
arc length = angle x radius
2.46888m(or 8.1 ft) = (π/3) x r
r =  (\pi /3)/2.46888
r = .425m
4 0
3 years ago
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