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Rom4ik [11]
1 year ago
6

Timothy's swim practice started at

Mathematics
1 answer:
Lynna [10]1 year ago
6 0

Answer:

1 hour and 15 minutes

Step-by-step explanation

There are 60 minutes in an hour. Add 15 minutes to get to 3:00 pm. From 3:00 pm to 4:00 pm is 1 hour. 15 minutes + 1 hour is 1 hour and 15 minutes

Hope this helps!

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There are 140 members in a community sports program. Sixty-five percent of these members play soccer.
defon
Well, we have to determinate the 65% of 140, which are 91 members play soccer. 

The total members are 140, if 91 play soccer, 49 members do not play soccer. 

The answer is 49 members.
3 0
3 years ago
A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students state
Lorico [155]

Answer:

a=502 +1.28*81=605.68

So the value of height that separates the bottom 90% of data from the top 10% is 605.68.  

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

X \sim N(502,81)  

Where \mu=502 and \sigma=81

We want to find a value a, such that we satisfy this condition:

P(X>a)=0.1   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.9 of the area on the left and 0.1 of the area on the right it's z=1.28. On this case P(Z<1.28)=0.9 and P(z>1.28)=0.1

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=1.28

And if we solve for a we got

a=502 +1.28*81=605.68

So the value of height that separates the bottom 90% of data from the top 10% is 605.68.  

3 0
3 years ago
What is the first step in simplifying
seraphim [82]
Distribute the negative b and negative one to he terms in the parentheses
In an expression, if there area brackets, you always have to expand THEN solve it
7 0
3 years ago
Ill mark btainlist pllssss helpp
Hatshy [7]

Answer:

1cm-----80000m

1cm-----8000000cm

1cm×3.275-----80km×3.275

3.275cm

3 0
3 years ago
Please help with this!! Explain your answer I will mark brainliest!!!
Maru [420]

Answer:

asa

Step-by-step explanation:

it says that angle 6 and angle 9 are congruent and side om is congruent to side em and then the angle 7 and 8 are congruent because they are vertical angles and vertical angles are equal to each other. so it gives you angle side angle which is why the correct answer is asa

7 0
2 years ago
Read 2 more answers
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