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3 years ago

9

Scores on an exam are normally distributed with a mean of 67.5 and a standard deviation of 10. Find the percent of the scores th

at satisfy each question.
a)Less than 32

b)At least 70

c)Between 56 and 66

1 answer:

lozanna [386]3 years ago

6 0

Answer:

C

Step-by-step explanation:

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What statements is equal to the expression p\11

V125BC [204]

Answer: "p divided by 11" or "p over 11" or "p by 11".

Step-by-step explanation:

We use mathematical statements to express any algebraic expression.

For example: We write 2x as "2 is multiplied by x " or " product of 2 and x".

p+q as "sum of p and q" or "p is added to q"

The given expression is : $\dfrac{p}{11}$

In mathematical statements, it can be written as "p divided by 11" or "p over 11" or "p by 11".

Hence, the statements are equal to the expression $\dfrac{p}{11}$ are "p divided by 11" or "p over 11" or "p by 11".

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3 years ago

Which of the following represents 2x - 5y + 15 = 0 written in slope-intercept form?

arsen [322]

R those the only options?
slope intercept form is y=mx+b
i got y = 2/5x + 3

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3 years ago

17. Which of the following transformations does NOT preserve congruence?

abruzzese [7]

Answer:

Sir you need to put more Explannation in it because i cant figure it out properly

Step-by-step explanation:

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2 years ago

Read 2 more answers

Suppose I have an urn with 9 balls: 4 green, 3 yellow and 2 white ones. I draw a ball from the urn repeatedly with replacement.

Mrrafil [7]

Answer:

$E(X_n)=\frac{2(n-1)}{27}$

$E(y)=\frac{14}{9}$

Step-by-step explanation:

From the question we are told that:

Sample size n=9

Number of Green $g=4$

Number of yellow $y=4$

Number of white $w=4$

Probability of Green Followed by yellow P(GY) ball

$P(GY)=\frac{4}{9}*\frac{3}{9}$

$P(GY)=\frac{4}{27}$

Generally the equations for when n is even is mathematically given by

$Probability of success P(S)=\frac{4}{27}$

$Probability of Failure P(F)=\frac{27-4}{27}$

$Probability of Failure P(F)=\frac{23}{27}$

Therefore

$E(X_n)=\frac{n}{2}*P$

$E(X_n)=\frac{n}{2}*\frac{4}{27}$

$E(X_n)=\frac{2n}{27}$

Generally the equations for when n is odd is mathematically given by

$\frac{n-1}{2}$

$E(X_n)=\frac{n-1}{2}*\frac{4}{27}$

$E(X_n)=\frac{2(n-1)}{27}$

b)

Probability of drawing white ball

$P(w)=\frac{2}{9}$

Therefore

$E(w)=\frac{1}{p}$

$E(w)=\frac{1}{\frac{2}{9}}$

$E(w)=\frac{9}{2}$

Therefore

$E(y)=[E(w)-1]\frac{4}{9}$

$E(y)=[\frac{9}{2}-1]\frac{4}{9}$

$E(y)=\frac{14}{9}$

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3 years ago

Please help me asap!!!

Deffense [45]

Answer:

8

Step-by-step explanation:

8 0

2 years ago