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3 years ago

17 points

Mathematics

1 answer:

nexus9112 [7]3 years ago

5 0

Answer:

D. 18.4, 18.04, 17.86, 17.68

Step-by-step explanation:

Very Easy!

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Item 2 At a park, there are 38 people playing tennis. Some are playing doubles (2 teams of 2 people each) and some are playing s

Art [367]

Answer:

Number of doubles games = 6

Number of singles games = 7

Step-by-step explanation:

Let the number doubles be d and number of singles be s.

There are 13 matches in progress.

d + s = 13 ----------------------eqn 1

There are 38 people playing tennis. A doubles match requires 4 players, and a singles match requires 2 players.

4 d + 2 s = 38 ----------------------eqn 2

eqn 1 x 2

2d + 2s = 26 ----------------------eqn 3

eqn 2 - eqn 3

4 d + 2 s - 2d + 2s = 38 - 26

2d = 12

d = 6

Substituting in eqn 1

6 + s = 13

s = 7

Number of doubles games = 6

Number of singles games = 7

5 0

3 years ago

I'm being a procrastinator with school work- I need people to talk to.

PolarNik [594]

Answer:

I'll talk to you!

Step-by-step explanation:

3 0

3 years ago

The mean number of hours per day spent watching television, according to a national survey, is 3.5 hours, with a standard deviat

aleksley [76]

Answer:

4.5 hour and 2 hour

Step-by-step explanation:

Given: The mean number of hours per day spent watching television, according to a national survey, is 3.5 hours, with a standard deviation of two hours.

To Find: If each time was increased by one hour, what would be the new mean and standard deviation.

Solution:

let the total numbers entries of hours in survey be = $\text{N}$

each entry in survey be = $\text{x}_{i}$

mean of survey is = $\mu$ = $3.5$ $\text{hours}$

standard deviation is = $\sigma$ = $2$ $\text{hours}$

if each entry in survey is increased by one hour then,

each new entry in survey is = $\text{x}_{i}+1$

the new mean is $\mu_{new}$ = $\frac{\text{sum of all hours}}{total number of entries}$

$\frac{\text{x}_{1} +1+\text{x}_{2}+1 +....+\text{x}_{N}+1 }{N}$

$\frac{(\text{x}_{1} +\text{x}_{2} +....+\text{x}_{N})+\text{N}\times1 }{N}$

$\frac{(\text{x}_{1} +\text{x}_{2} +....+\text{x}_{N})}{N}$ + $\frac{\text{N}\times1 }{N}$

$\mu_{new}$ = $\mu$ + 1= $4.5$ $\text{hours}$

now,

standard deviation is $\sigma_{new}=$ $\sqrt{\sum_{1}^{N}\frac{(\text{x}_{inew}-\mu_{new})^{2}}{N}}$

$\text{x}_{inew}= \text{x}_{i}+1$

$\mu_{new}=\mu+1$

putting values,

$\sqrt{\sum_{1}^{N}\frac{(\text{x}_{i}+1-\mu-1)^{2}}{N}}$

$\sqrt{\sum_{1}^{N}\frac{(\text{x}_{i}-\mu)^{2}}{N}}$ = $\sigma$

$\sigma_{new}$ =2

new mean and standard deviation are $4.5$ and $2$ $\text{hours}$

5 0

3 years ago

I am please help on 14 and 15 please actually answer please

choli [55]

14) 160 because of supplementary angles 15) 61 because of complementary angles

3 0

3 years ago

Read 2 more answers

5/4 to the 3rd power

Crank

Answer:

1.953125 is the answer I believe

or 125/64

or 1 61/64

5 0

3 years ago

Read 2 more answers