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Norma-Jean [14]

3 years ago

9

Laticia randomly selected 25% off the seventh grade students and her school and ask them their favorite season of the students s

urveyed 51 Chose summer as their favorite season based on the data what is the most reasonable prediction of the number of seventh-grade students in high school who would choose summer as a favorite season

1 answer:

OverLord2011 [107]3 years ago

8 0

One thousand two hundred seventy five

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Can someone help with this

ryzh [129]

Answer:

85

explanation:
too long

5 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

Y = x + 2<br> y = 3x - 4

exis [7]

Answer:

x=3; y=5

Step-by-step explanation:

y=x+2

y=3x-4

so x+2=3x-4

2x=6

x=3

because y=x+2

x=3

so y=3+2

=5

8 0

3 years ago

6. A spinner with 8 equal sections was spun 240 times. What is a reasonable

Crazy boy [7]

Answer: 120 times.

Step-by-step explanation: 4/8 = x/240. 4/8 x 240/1 4/1 x 30/1 = 120/1 = 120.

Reduce 8 to 1 and 240 to 30.

6 0

4 years ago

Help quick! The table below shows the water temperature at certain depths of a lake. Using an logarithmic model, write an equati

Norma-Jean [14]

Answer:

we need the graph lol

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers