All categories

4 years ago

Maths question pls answer

Mathematics

1 answer:

alukav5142 [94]4 years ago

6 0

Answer:

answer should be 52.4 mins

Step-by-step explanation:

find the midpoint for each time:

1. 15mins = 7students

2. 45mins = 27 students

3. 75mins = 12 students

4. 100 = 4students

Then, do the normal mean calculation by adding up all the values and dividing it by 50.

7*15 + 27*45 + 12*75 + 100*4 = 2620

2620/50 = 52.4mins

You might be interested in

Aubrey has a Shelf full of books exactly one third of books on the Shelf are Mysteries. Aubrey has read 10 of the mysteries on t

CaHeK987 [17]

The correct answer for this question is this one: "147"

Here's how to solve this problem.

Let x = number of mystery books on the shelf 
Let 3x = total number of books on the shelf 

we are told that 
x/5<10<x/4 
multiply by 20, 
4x<200<5x 
which means that 
40<x<50 
So the number of mystery books can be any number between 41 and 49.
In other words, the possible total number of books could be three times the above numbers, 123, 126, 129,.... 
Choose the one that suits your answer choices.

Here are the following choices:
Which could be the number of books on the shelf?
A. 120 B 140 c 147 D 150

4 0

3 years ago

In how many ways can a subcommittee of 6 students be chosen from a committee which consists of 10 senior members and 12 junior m

givi [52]

Answer:

The number of ways is 13860 ways

Step-by-step explanation:

Given

Senior Members = 10

Junior Members = 12

Required

Number of ways of selecting 6 students students

The question lay emphasis on the keyword selection; this implies combination

From the question, we understand that

4 students are to be selected from senior members while 2 from junior members;

The number of ways is calculated as thus;

Ways = Ways of Selecting Senior Members * Ways of Selecting Junior Members

$Ways = ^{10}C_4 * ^{12}C2$

$Ways = \frac{10!}{(10-4)!4!)} * \frac{12!}{(12-2)!2!)}$

$Ways = \frac{10!}{(6)!4!)} * \frac{12!}{(10)!2!)}$

$Ways = \frac{10 * 9 * 8 * 7 *6!}{(6! * 4*3*2*1)} * \frac{12*11*10!}{(10!*2*1)}$

$Ways = \frac{10 * 9 * 8 * 7}{4*3*2*1} * \frac{12*11}{2*1}$

$Ways = \frac{5040}{24} * \frac{132}{2}$

$Ways = 210 * 66$

$Ways = 13860$

Hence, the number of ways is 13860 ways

7 0

3 years ago

. A rectangle has a length of 5x + 2 in, and a

Veronika [31]

Answer:

18x + 16

Step-by-step explanation:

2 x length + 2 x width = perimeter

2(5x + 2) + 2(4x + 6)

= 10x + 4 + 8x + 12

= 18x + 16

3 0

2 years ago

The scale on a model railroad train set is 3.5 millimeters to 1 foot. If the length of a model car in the set is 150 millimeters

Vera_Pavlovna [14]

Answer:

The approximate length of the actual car is 43 feet.

Step-by-step explanation:

Given:

The scale on a model railroad train set is 3.5 millimeters to 1 foot. If the length of a model car in the set is 150 millimeters.

Now, to find the approximate length of the actual car.

Let the actual length of the car is $x.$

The length of a model car in the set is 150 millimeters.

As, given the scale on a model railroad train set is 3.5 millimeters to 1 foot.

So, 3.5 millimeters equivalent to 1 foot.

Thus, 150 millimeters to $x$ .

Now, to get the actual length of the car by using cross multiplication method:

$\frac{3.5}{1} =\frac{150}{x}$

By using cross multiplying we get:

$3.5x=150$

Dividing both sides by 3.5 we get:

$x=42.85\ feet.$

The approximate length of the actual car = 43 feet.

Therefore, the approximate length of the actual car is 43 feet.

3 0

3 years ago

Read 2 more answers

How many degrees matches to the radian measure of π/2

prohojiy [21]

Answer:

π/2 = 90°

Step-by-step explanation:

Given that,

Radian measure = π/2

The formula used to convert radian measure to degree measure is given by :

$\text{Degrees}=\dfrac{180^{\circ}}{\pi}\times \text{radians}\\\\=\dfrac{180^{\circ}}{\pi}\times \dfrac{\pi}{2}\\\\=90^{\circ}$

So, the degree matches for π/2 is 90°.

6 0

3 years ago