(PLEASE HELP)James tosses a coin 50 times. It lands on heads 23 times and on tails 27 times.

Find the miles per second traveled if one travels 40 miles in 4 hours.

katovenus [111]

$\dfrac{40 \textrm{ miles}}{4 \textrm{ hours}} \times \dfrac{1 \textrm{ hour}}{60 \times 60 \textrm{ seconds}} = \dfrac{1}{360} \textrm{ miles per second}$

8 0

4 years ago

In \triangle BCD,△BCD, \overline{BC}\cong \overline{DB}

Mariana [72]

Answer:16.5

Step-by-step explanation: x+x+147=180

2x+147=180

2x=33

2x=33 divide by 2

x=16.5

8 0

3 years ago

(Based on Q1 ~ Q3) According to the Bureau of the Census, 18.1% of the U.S. population lives in the Northeast, 21.9% inn the Mid

vekshin1

Answer:

We can therefore conclude that the geographical distribution of hotline callers could be the same as the U.S population distribution.

Step-by-step explanation:

The null Hypothesis: Geographical distribution of hotline callers could be the same as the U.S. population distribution

Alternative hypothesis: Geographical distribution of hotline callers could not be the same as the U.S. population distribution

The populations considered are the Midwest, South, Northeast, and west.

The number of categories, k = 4

Number of recent calls = 200

Let the number of estimated parameters that must be estimated, m = 0

The degree of freedom is given by the formula:

df = k - 1-m

df = 4 -1 - 0 = 3

Let the significance level be, α = 5% = 0.05

For α = 0.05, and df = 3,

from the chi square distribution table, the critical value = 7.815

Observed and expected frequencies of calls for each of the region:

Northeast

Observed frequency = 39

It contains 18.1% of the US Population

The probability = 0.181

Expected frequency of call = 0.181 * 200 = 36.2

Midwest

Observed frequency = 55

It contains 21.9% of the US Population

The probability = 0.219

Expected frequency of call = 0.219 * 200 =43.8

South

Observed frequency = 60

It contains 36.7% of the US Population

The probability = 0.367

Expected frequency of call = 0.367 * 200 = 73.4

West

Observed frequency = 46

It contains 23.3% of the US Population

The probability = 0.233

Expected frequency of call = 0.233 * 200 = 46

$x^{2} = \sum \frac{(O_{i} - E_{i}) ^{2} }{E_{i} } , i = 1, 2,.........k$

Where $O_{i} =$ observed frequency

$E_{i} =$ Expected frequency

Calculate the test statistic value, x²

$x^{2} = \frac{(39 - 36.2)^{2} }{36.2} + \frac{(55 - 43.8)^{2} }{43.8} + \frac{(60 - 73.4)^{2} }{73.4} + \frac{(46 - 46.6)^{2} }{46.6}$

$x^{2} = 5.535$

Since the test statistic value, x²= 5.535 is less than the critical value = 7.815, the null hypothesis will not be rejected, i.e. it will be accepted. We can therefore conclude that the geographical distribution of hotline callers could be the same as the U.S population distribution.

7 0

3 years ago

Help please anyone I really need it.

alekssr [168]

Answer:

[See Below]

Step-by-step explanation:

$Hey~There!$

______________________

➜ To solve this, we have to subtract:

$100-13=87$

➜ To make sure we are correct, we add:

$87+13=100$

______________________

So your answer would be $\bold~x=87$ .

______________________

$Hope~this~helps~Mate!\\-Your~Friendly~Answerer,~Shane$ ヅ

6 0

4 years ago

What is square root of 76

pentagon [3]

An easy way to do it is to guess and try all the combinations

or the math way is to find all the factors
76=2*2*19

so the answer is 2 times the square root of 19 or 8.72

3 0

3 years ago

Read 2 more answers