Check all of the situations that you would expect to be approximately normally distributed.

2 answers:

7 0

A normal distribution occurs when there is a symmetrical distribution of the elements around the mean.

The following would have this type of distribution:
SAT scores for high school seniors
shoes sizes of 17 year-old males
age at which a child loses his or her first tooth

topjm [15]3 years ago

6 0

Answer:

Step-by-step explanation:

From the given options we find that

SAT scores of high school senios can be expected to be normal

IIoption cannot be correct as this salaries would be higher than average and need not be bell shaped so nor notmal

III Option show sizes of 17 year old mates can be expected to be normal

IV option is also normal since the age at which a child loses his or her teeth would have population of large size with mean and symmetrical distribution

IV option is incorrect as between 1 and 6 is a certain event with p = 1

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Yuson must complete 45 hours of community service. She does 3 hours each day. Which linear equation represents the hours Yuson h

Daniel [21]

Answer:

y=45-3x

Step-by-step explanation:

we want y, which is the number of hours left. to find this, we take:

hours left=total # of hours required - hours worked/day

so:

y=45-3x

(because x could be any number: 2 days, 3 days, etc.)

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3 years ago

The sum of the squares of two positive integers is 394. If one integer is 2 less than the other and the larger integer is x. Fin

IgorLugansk [536]

Larger is x
the other is called y
sum of squares is 394
x^2+y^2=394
one is 2 less that other
x>y so
y+2=x
subsitute y+2 for x

(y+2)^2+y^2=394
expand
y^2+4y+4+y^2=394
add like terms
2y^2+4y+4=394
divideboth sides by 2
y^2+2y+2=197
subtract 197 from both sides
y^2+2y-195=0
factor
(y+15)(y-13)=0
set each to zero
y+15=0
y=-15
impossible since it is stated that they are positive so get rid of this solution
y-13=0
y=13

find other
y+2=x
13+2=x
15=x

numbers are 13 and 15

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3 years ago

The total surface area of a hemisphere is 45 <img src="https://tex.z-dn.net/?f=%5Cpi%5Cp" id="TexFormula1" title="\pi\p" alt=

rjkz [21]

Answer:

The volume of the hemisphere

V = 121.33086 cubic centimeter

Step-by-step explanation:

Step(i):-

Given that the total surface area of a hemisphere = 45π cm²

The total surface area of a hemisphere = 3π r²

Equating