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4 years ago

In calculating one variable statistics you find the standard deviation to be equal to zero

1 answer:

6 0

We can conclude that All the data points are exactly the same. When we calculate one variable statistic and we find that the standard deviation is equal to zero most likely that we can conclude is that all the data points will be exactly the same.

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2. Create an estimated probability distribution for the time teens spend texting.

Furkat [3]

Answer:

Hours 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Frequency* 0.2 0.09 0.25 0.18 0.11 0.07 0.05 0.02 0.01 0.02 0.01

Problem Statement:

The table shows the number of hours, to the nearest half hour per day, that teens spend texting according to a random sample of 870 teenagers aged 13–18 in a large urban city.

Hours 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Frequency 170 82 220 153 92 58 40 15 12 18 10

Step-By-Step Explanation:

As we need the estimated probability distribution for teens spending time texting, we will be needing the total sample size.

As given in the problem statement,

Total Sample Size = 870

To calculate estimated probability distribution, we will convert the frequency sample into estimated probability distribution, for that:

Estimated Probability Distribution (Frequency*)= $\frac{Frequency.Sample.Size.of.that.hour}{Total.Sample.Size}$

For Example:

Estimated probability distribution that teens spend 0 hours texting= $\frac{170}{870} =0.20$

Similarly

Estimated probability distribution that teens spend 0.5 hours= $\frac{82}{870} =0.09$

Using the same formula we get:

Hours 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Frequency* 0.2 0.09 0.25 0.18 0.11 0.07 0.05 0.02 0.01 0.02 0.01

(Note: Frequency* is the estimated probability distribution)

4 0

3 years ago

Read 2 more answers

2. During typhoon Ambo, PAGASA tracks the amount of accumulating rainfall. For

Luda [366]

Answer:

The piecewise equation is given as : $A(t)=\begin{cases} 25x& \text{ if } 0 \leq x \leq 3 \\ 75& \text{ if } 3$

Step-by-step explanation:

Let x be the time in hour and A(x) be the amount of accumulating rainfall at time x.

We are given that in the first three hours the rain fell at a constant rate of 25mm per hour

Amount of rainfall in 1 hour = 25

Amount of rainfall in t hours = 25x

$A(x) = 25x ; 0 \leq x \leq 3$

The rain then slows down and remains constant

So, Amount of rain for that hour = $25 \times 3 = 75 mm$

75 mm ; 3

Now we are given that started again at a constant rate of 20 mm per hour for the next two hours.

Amount of rain after 4 hours = $75+20(x-4) ; 4 \leq x\leq 6$

The rain increases at a rate of 20t from 4 ≤ x ≤ 6.

Hence the piecewise equation is given as : $A(t)=\begin{cases} 25x& \text{ if } 0 \leq x \leq 3 \\ 75& \text{ if } 3$

7 0

3 years ago

What is the number if 6/7 of 28 is equal to 30% of that number.

makkiz [27]

Answer:

80 is the actual number

Step-by-step explanation:

(28/7)(6)=24

24 x 100=2400

2400/30=80

80 x .3 = 24

5 0

3 years ago

translate this into an expression: the quotient of a number, x, and 8, could you please explain it to me?

Xelga [282]

Answer:

x/8

Step-by-step explanation:

First, we are given "the quotient of...". This means that we are dividing something/something else. If two numbers are given in the phrase "something and something else", the first number given will be the something, and the second number will be the something else.

The first number listed is x. Therefore, we have

x/something else.

Next, we are given "and 8", so we have x/8 as our expression

3 0

3 years ago

40,023,032 written in two other forms

chubhunter [2.5K]

word form: forty million, twenty-three thousand, thirty-two

expanded factors form: 4 × 10,000,000

+ 0 × 1,000,000

+ 0 × 100,000

+ 2 × 10,000

+ 3 × 1,000

+ 0 × 100

+ 3 × 10

+ 2 × 1

4 0

3 years ago