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2 years ago

Please help I’m in class rn

Mathematics

2 answers:

4vir4ik [10]2 years ago

4 0

Answer:

Step-by-step explanation:

Sav [38]2 years ago

4 0

18 because figure A is a scale of figure B

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A study indicates that 37% of students have laptops. You randomly sample 30 students. Find the mean and the standard deviation o

Brilliant_brown [7]

Answer:

The mean and the standard deviation of the number of students with laptops are 1.11 and 0.836 respectively.

Step-by-step explanation:

Let X = number of students who have laptops.

The probability of a student having a laptop is, P (X) = p = 0.37.

A random sample of n = 30 students is selected.

The event of a student having a laptop is independent of the other students.

The random variable X follows a Binomial distribution with parameters n and p.

The mean and standard deviation of a binomial random variable X are:

$\mu=np\\\sigma=\sqrt{np(1-p)}$

Compute the mean of the random variable X as follows:

$\mu=np=30\times0.37=1.11$

The mean of the random variable X is 1.11.

Compute the standard deviation of the random variable X as follows:

$\sigma=\sqrt{np(1-p)}=\sqrt{30\times0.37\times(1-0.37)}=\sqrt{0.6993}=0.836$

The standard deviation of the random variable X is 0.836.

5 0

3 years ago

The table shows the results of a survey of 400 random people on whether they like liquid soap, bar soap, or both. A 4-column tab

In-s [12.5K]

Answer: 100/400

Step-by-step explanation:

$\begin{array}{l|c|c|c}&Liquid&Not\ Liquid&Total\\ Bar&200&100&300\\Not\ Bar&80&20&100\\Total&280&120&400\end{array}$

$\dfrac{Not\ Bar:Total}{Total:Total}\quad =\dfrac{100}{400}$

4 0

3 years ago

3. The first three place values to the right of the decimal point are the tenths place, the hundredths place, and the thousandth

Katarina [22]

Answer:

True

Step-by-step explanation:

0 . 0 0 0

whole Tenths Hundredths Thousandths

3 0

2 years ago

F the simple interest on $4000 for 6 years is $1440, then what is the interest rate?

Alborosie

Answer:

Step-by-step explanation:

$rate=\frac{interest \times 100}{principle \times time } \\=\frac{1440 \times 100}{4000 \times 6 } \\=6 \%$

7 0

2 years ago

Brianna and Holden hiked 6 2/9 miles on Monday and 2 2/3 miles on Tuesday. How many times as far did they hike on Monday as they

spin [16.1K]

Answer:

2 1/3 times as far

Step-by-step explanation:

The ratio of distances is ...

(Monday distance) / (Tuesday distance) = (6 2/9)/(2 2/3)

= (56/9)/(8/3) = (56·3)/(8·9) = 7/3 = 2 1/3

They hiked 2 1/3 times as far on Monday as they did on Tuesday.

6 0

3 years ago