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mario62 [17]
2 years ago
13

Answer these 2 questions please

Mathematics
2 answers:
Dmitry [639]2 years ago
8 0
Where’s the question?
horrorfan [7]2 years ago
8 0
What 2 questions. I can’t see any?
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The times of the runners in a marathon are normally distributed, with a mean of 3 hours and 50 minutes and a standard deviation
balu736 [363]

Answer: 0.16

Step-by-step explanation:

Given that the run times provided are normally distributed ;

Mean(x) of distribution = 3 hours 50 minutes

Standard deviation(s) = 30 minutes

The probability that a randomly selected runner has a time less than or equal to 3 hours 20 minutes

3 hours 20 minutes = (3 hrs 50 mins - 30 mins):

This is equivalent to :

[mean(x) - 1 standard deviation]

z 1 standard deviation within the mean = 0.84

z, 1 standard deviation outside the mean equals:

P(1 - z value , 1standard deviation within the mean)

1 - 0.8413 = 0.1587

= 0.16

7 0
3 years ago
Which values are solutions to the inequality below? √x > 25?
dezoksy [38]

Answer:

C and D

Step-by-step explanation:

So basically when u square -5 or +5, u get 25 either way

And since the square root of x is greater than or equal to 25, u can use both of them for answers.

5 0
3 years ago
When the town of Manning first started its voluntary recycling program, 2500 of the town's residence participated. The town pred
Paraphin [41]
Answer: The correct answer is Choice D.

This is an example of an exponential equation. They are in the form of y=ab^x, where a is the starting value, b is the rate and x is the number of years.

Our data starts at 2500 and increases by 5%, or 100% + 5% = 1.05.

If you put them together, you have the equation y = 2500(1.05)^x, Choice D.
3 0
2 years ago
Mathematics help needed. <br><br> Which of the following statements are true regarding functions?
Evgen [1.6K]
A and c. No horizontal line
3 0
3 years ago
true or false? the circumcenter of a triangle is the center of the only circle that can be inscribed about it
MissTica

Answer:

TRUE

Step-by-step explanation:

The circumcenter of a triangle is the center of the only circle that can be circumscribed about it

6 0
3 years ago
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