1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kondaur [170]
2 years ago
10

Ook

Mathematics
1 answer:
Leya [2.2K]2 years ago
7 0

The cars speed in kilometres per hour is = 87.2 Km/hr

<h3>Calculation of speed of a car:</h3>

The speed of the car = d/t

The distance(d) travelled by the car = 41 kilometers

The time(t) taken to cover the distance = 28 minutes

To solve, convert minutes to hours

But 60 mins = 1 hour

28mims = X

cross multiply,

X = 28/60

X = 0.47hour

To calculate the speed substitute d and t with it's variables provided.

speed = 41/0.47

=87.2 Km/hr ( which is to the nearest tenth)

Therefore, The cars speed in kilometres per hour is = 87.2 Km/hr

Learn more about speed here:

brainly.com/question/24872445

You might be interested in
Es
mixer [17]
D i'm only typing this because it's gotta be 20 characters
6 0
3 years ago
Why doesn’t zero have an opposite
Neko [114]
Zero does not have a opposite, because it is not a positive number nor a negative number. It has no reciprocal either

hope this helps
3 0
3 years ago
The mean number of words per minute (WPM) read by sixth graders is 97 with a standard deviation of 19 WPM. If 75 sixth graders a
andrey2020 [161]

Answer:

0.0174 = 1.74% probability that the sample mean would be greater than 101.63 WPM

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}};

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem, we have that:

\mu = 97, \sigma = 19, n = 75, s = \frac{19}{\sqrt{75}} = 2.1939

What is the probability that the sample mean would be greater than 101.63 WPM?

This is 1 subtracted by the pvalue of Z when X = 101.63. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{101.63 - 97}{2.1939}

Z = 2.11

Z = 2.11 has a pvalue of 0.9826.

1 - 0.9826 = 0.0174

0.0174 = 1.74% probability that the sample mean would be greater than 101.63 WPM

5 0
3 years ago
Which of these is a simplified form of the expression –b – 2(2b + 5)?
monitta

Answer:

c

Step-by-step explanation:

-b -4b - 10

-5b - 10

hence c is the answer

3 0
2 years ago
Read 2 more answers
What is the ratio of the corresponding side lengths?<br> 4:9<br> 4:2<br> 26:26<br> 4.5:2
Evgen [1.6K]

Answer:

4:2

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Kendrick’s math quiz grades are 90, 100, 48, 88, 100, and 96. Find the MEAN of Kendrick’s scores.
    9·2 answers
  • Either enter an exact answer in terms of<br> or use 3.14 for .<br> units
    12·2 answers
  • Find two different ways to show how you know either 3/4 is greater than 2/3
    12·1 answer
  • The two polygons are similar, solve for x
    12·1 answer
  • Debbie ate 1/8 of a large brownie. Julian ate 1/2 of a small brownie. Julian says, "I ate more brownies than you because 1/2&gt;
    13·2 answers
  • Guys I need help I'm giving brainlist also show your work for me please this is my last math problem help​
    11·1 answer
  • Help me with this please!!
    9·1 answer
  • Can anyone help me with this
    6·1 answer
  • At a farmers’ market, Karen and Alice each bought some bread that cost $2 per loaf. Then Karen spent $3 to purchase other items,
    10·1 answer
  • Find the slope from points (9,-13), (7,-11)? That’s what my question is for my math homework.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!