All categories

3 years ago

95% of people in my street have a car. There are 160 people in my street. how many do not have a car?

Mathematics

1 answer:

Over [174]3 years ago

7 0

Answer:

8 people on your street do not have a car.

Step-by-step explanation:

So we know that 95% of people have a car. There are 160 people on your street and your are trying to find out how many people do not have a car.

If 95% of people have a car, then 100% - 95% of people, or 5% of people, do not have a car. Using this we can find how many of the 160 people on your street do not have a car. To do this, we would multiply the percent of people who do not have a car (5%, or 0.05) by the number of people on your street (160).

5% × 160 = 0.05 × 160 = 8

8 people on your street do not have a car.

I hope this helps. :)

You might be interested in

What is the value of e ^(in 7x) A,1 B,7e C,7x D,7

ElenaW [278]

I will have to assume that you actually meant " e^(ln 7x). The exponential and logarithmic functions are inverses of each other, so d^(ln 7x) = 7x (answer C).

7 0

3 years ago

The quote for USD/CHF is listed as 1.4481/88. How many swiss francs does it cost to buy one dollar?

pychu [463]

Based on this quote, this answer is 60.77.

The ratio given in USD to CHF is 1.4481/88. Since we want 1 USD, we divide both parts of the ratio by 1.4481:

1.4481 ÷ 1.4481 = 1

88 ÷ 1.4481 = 60.77

4 0

3 years ago

The mean hours of sleep that students get per night is 7 hours, the standard deviation of hours of sleep is 1.7 hours, and the d

densk [106]

Answer:

c. 3.6 and 10.4 hrs

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviations of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean 7, standard deviation 1.7.

For about 95% of students, nightly amount of sleep is between

7 - 2*1.7 = 7 - 3.4 = 3.6 hours

7 + 2*1.7 = 7 + 3.4 = 10.4 hours

So the correct answer is:

c. 3.6 and 10.4 hrs

5 0

3 years ago

assume that when adults with smartphones are randomly selected 15 use them in meetings or classes if 15 adult smartphones are ra

Tanzania [10]

Answer:

The probability that at least 4 of them use their smartphones is 0.1773.

Step-by-step explanation:

We are given that when adults with smartphones are randomly selected 15% use them in meetings or classes.

Also, 15 adult smartphones are randomly selected.

Let X = <em>Number of adults who use their smartphones</em>

The above situation can be represented through the binomial distribution;

$P(X = r) = \binom{n}{r}\times p^{r} \times (1-p)^{n-r} ; n = 0,1,2,3,.......$

where, n = number of trials (samples) taken = 15 adult smartphones

r = number of success = at least 4

p = probability of success which in our question is the % of adults

who use them in meetings or classes, i.e. 15%.

So, X ~ Binom(n = 15, p = 0.15)

Now, the probability that at least 4 of them use their smartphones is given by = P(X $\geq$ 4)

P(X $\geq$ 4) = 1 - P(X = 0) - P(X = 1) - P(X = 2) - P(X = 3)

= $1- \binom{15}{0}\times 0.15^{0} \times (1-0.15)^{15-0}-\binom{15}{1}\times 0.15^{1} \times (1-0.15)^{15-1}-\binom{15}{2}\times 0.15^{2} \times (1-0.15)^{15-2}-\binom{15}{3}\times 0.15^{3} \times (1-0.15)^{15-3}$

= $1- (1\times 1\times 0.85^{15})-(15\times 0.15^{1} \times 0.85^{14})-(105 \times 0.15^{2} \times 0.85^{13})-(455 \times 0.15^{3} \times 0.85^{12})$

= <u>0.1773</u>

3 0

3 years ago

Evaluate the expression below at x= 4.

Gre4nikov [31]

Suggestion:

Try to explain this more clearly.

Why you should try my suggestion:

Because it will help others so they understand what your question is.

My note:

Hoped I helped, and I would love to be marked as Brainliest! Thanks!

7 0

3 years ago