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mario62 [17]
3 years ago
8

Determine whether the random variable is discrete or continuous. a. The number of statistics students now reading a book. b. The

number of textbook authors now sitting at a computer. c. The exact time it takes to evaluate 27 plus 72. d. The number of free dash throw attempts before the first shot is made. e. The time it takes to fly from City Upper A to City Upper B. a. Is the number of statistics students now reading a book discrete or​ continuous?
Mathematics
1 answer:
andrey2020 [161]3 years ago
6 0

Answer:

Continuous random variables: c and e

Discrete random variables: a, b, d  

Step-by-step explanation:

We have to identify whether the random variable is discrete or continuous.

  • A discrete variable is a variable whose value is obtained by counting.
  • A continuous random variable X takes all values in a given interval of numbers.
  • Thus, a continuous variable can have values in decimals but a discrete random variable cannot take values in decimals.

a. The number of statistics students now reading a book.

Discrete random variable since number of students cannot take decimal values.

b. The number of textbook authors now sitting at a computer.

Discrete random variable since number of textbooks cannot be expressed in decimals but counted.

c. The exact time it takes to evaluate 27 plus 72.

It is a continuous random variable as it may take all values within an interval of time.

d. The number of free dash throw attempts before the first shot is made.

It is a discrete random variable since the number of throws can always be whole number.

e. The time it takes to fly from City Upper A to City Upper B.

Time is a continuous random variable.

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Step 3a: Calculating the average rate
Alex73 [517]

9514 1404 393

Answer:

  a) average rate = (total distance)/(total time)

  b) Rave = 2·R1·R2/(R1 +R2)

  c) cheetah's average rate ≈ 50.91 mph

Step-by-step explanation:

a) Let AB represent the distance from A to B. Let t1 and t2 represent the travel times (in hours) on leg1 and leg2 of the trip, respectively. Then the distances traveled are...

  First leg distance: AB = 70·t1   ⇒   t1 = AB/70

  Second leg distance: AB = 40·t2   ⇒   t2 = AB/40

The average rate is the ratio of total distance to total time:

  average rate = (AB +AB)/(t1 +t2)

  average rate = 2AB/(AB/70 +AB/40) = 2/(1/70 +1/40) = 2(40)(70)/(70+40)

  average rate = 560/11 = 50 10/11 . . . mph

__

No equations are given, so we cannot compare what we wrote with the given equations. In each step of the solution, we have used the rules of algebra and equality.

b) For two rates over the same distance (as above), the average is their harmonic mean:

  average rate = 2r1·r2/(r1+r2)

__

c) The cheetah's average rate was 50 10/11 mph ≈ 50.91 mph.

4 0
3 years ago
Please help me with this math problem!! Will give brainliest!!
Vlad1618 [11]
In this question, the given functions are

And we have to find the value of

Which is equal to

So we have to subtract the two functions that is

Correct option is the second option .


This is wrong DONT use it
8 0
2 years ago
Read 2 more answers
specialty T-shirts are being sold online for $30 each plus a one-time handling fee of $2.75 . The total cost is a function of th
myrzilka [38]

30(5)+2.75=152.75

The answer is D.

30t +2.75; 152.75

5 0
3 years ago
20)
Nataly [62]

Answer:

babysitting = $9

working at coffeehouse = $12

x = hours for babysitting

y = hours at coffeehouse

minimum = ≥

9x + 12y ≥ 240

Step-by-step explanation:

just a short note on which symbol you should use when you see these words in inequality questions:

i) use ≥

-more than or equal to

-not less than

-at least

-minimum

ii) use >

-more than

-greater than

iii) use ≤

-less than or equal to

-not more than

-at most

-maximum

iv) use <

-less than

7 0
2 years ago
9 - ? = 8.82
stepan [7]
1.18 is the answer!
8 0
2 years ago
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