All categories

3 years ago

Someone please help!

Mathematics

1 answer:

erastova [34]3 years ago

8 0

Answer:

k = 6.26

Step-by-step explanation:

Find the midpoint of each frequency range, multiply that number by the frequency, sum up and divide by the total frequency.

This will give the mean number.

[17*( 3 + 3.5)/2 + 21*(3.5 + k)/2 + 33*(k + 4)/2 + 54*(4 + 4.5)/2 + 15*(4.5 + 6)/2]/140 = 4.09
55.25 + 10.5k + 36.75 + 16.5k + 66 + 229.5 + 78.75 = 140*4.09
17k + 466.25 = 572.6
17k = 572.6 - 466.25
17k = 106.35
k = 106.35/17
k = 6.26

Note, I expected the value of k between 3.5 and 4. This is a bit of illogical outcome.

You might be interested in

Factor completely: 15x^2 − 40x − 15.

slega [8]

-5(3+8x+3x^2) this was my answer I’m sorry if I’d gotten it wrong

4 0

3 years ago

Read 2 more answers

What is the decimal of 1 over 25

Fudgin [204]

Answer:

0.04

Step-by-step explanation:

1 over 25 is just like 1 divided by 25 so plug that into a calculator to get 0.04

4 0

3 years ago

Read 2 more answers

Drag the diagram that correctly models each description to the correct container.

bekas [8.4K]

Answer:

1/3 of 1/4 : Top left and 1/5 of 5/6: Top right

Step-by-step explanation:

3 0

3 years ago

The price of a personal computer was 42,000 last year. If there is a decrease of

prohojiy [21]

You'll calculate the amount it was decreased by :

15% is also 15/100

15/100 * 42000

The two 0's in 100 cut 2 of the 0's in 42000 making it :

15/1 * 420

15* 420 = 6300

So, 6300 is the amount that the price is decreased by, but the question says the price of the PC (personal computer) after the decrease has happened not the price it decreased by :

So,

42000 - 6300 = 35700.

4 0

4 years ago

Malia is placing a barrier around the edge of a circular path with a diameter of 13 meters. The barriers are in lengths of 2.5 m

Lostsunrise [7]

Answer:

Step-by-step explanation:

8 0

3 years ago