1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ivanzaharov [21]
3 years ago
15

In a certain year, when she was a high school senior, Idonna scored 620 on the mathematics part of the SAT. The distribution of

SAT math scores in that year was Normal with mean 512 and standard deviation 117. Jonathan took the ACT and scored 24 on the mathematics portion. ACT math scores for that year were Normally distributed with mean 20.5 and standard deviation 5.4.
Find the standardized scores (±0.01) for both students. Assuming that both tests measure the same kind of ability, who had the higher score?
Idonna's standardized score is ____
Jonathan's standardized score is _____

a. Scores are equal
b. Idonna's score is less than Jonathan's
c. Idonna's score is higher than Jonathan's
Mathematics
1 answer:
MakcuM [25]3 years ago
5 0

Answer:

Idonna's standardized score is 0.92.

Jonathan's standardized score is 0.65.

Assuming that both tests measure the same kind of ability, who had the higher score?

c. Idonna's score is higher than Jonathan's

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

Idonna's standardized score is:

Idonna scored 620 on the mathematics part of the SAT. The distribution of SAT math scores in that year was Normal with mean 512 and standard deviation 117. So X = 620, \mu = 512, \sigma = 117

Her standardized score is Z

Z = \frac{X - \mu}{\sigma}

Z = \frac{620 - 512}{117}

Z = 0.92

Idonna's standardized score is 0.92.

Jonathan's standardized score is:

Jonathan took the ACT and scored 24 on the mathematics portion. ACT math scores for that year were Normally distributed with mean 20.5 and standard deviation 5.4. So X = 24, \mu = 20.5, \sigma = 5.4

His standardized score is Z

Z = \frac{X - \mu}{\sigma}

Z = \frac{24 - 20.5}{5.4}

Z = 0.65

Jonathan's standardized score is 0.65.

Assuming that both tests measure the same kind of ability, who had the higher score?

Idonna's had the higher z-score, so her score is higher.

So the correct answer is:

c. Idonna's score is higher than Jonathan's

You might be interested in
Which equation describes a line that passes through (-5,-8) and is perpendicular to y= 5/4x + 10
lara31 [8.8K]
Answer: y = -4/5x - 12

1. First find slope. Since you are trying to find a line perpendicular to y = 5/4x + 10, the slope would be the negative reciprocal of 5/4x.

slope = - 4/5x

2. plug in (-5,-8) and the slope of -4/5 to the point slope form equation
(y-y2) = slope (x-x2)

= y+8=-4/5(x+5)

3. solve and simply y+8=-4/5(x+5)

y = -4/5x - 12 is your answer
8 0
3 years ago
Which statement about is true? X = 1 is an extraneous solution. X = 1 is a true solution x = 3 is an extraneous solution. X = 3
DanielleElmas [232]

Answer:

x = 3 is an extraneous solution

Step-by-step explanation:

7 0
2 years ago
-UIVIT UUNNU INTEREST
Jobisdone [24]

Answer:

Step-by-step explanation:

Principal, P = $4,000

Interest rate, r = 3% = 0.03

Period, t = 20 years

Number of times compounded in a year = 4

Amount , A = P( 1 + r/n)^tn

A = 4000( 1 + 0.03/4)^4*20

A = 4000( 1 + 0.0075) ^80

A =4000( 1.0075) ^80

A = 4000* 1.818

A = $7272.18

5 0
3 years ago
Solve for h.<br><br> B=hm<br> h=??<br><br> I've been struggling with this please help
miss Akunina [59]
B=hm\\&#10;h=\dfrac{B}{m}
6 0
3 years ago
Did I do this correctly?
butalik [34]

6/x= -2/18

Cross multiply. ( Multiply the numerators together ) . ( Multiply the denominators together (.

6*18= - 2*x

108= -2x

Divide by -2 for 108 and -2x

108/-2= -2x/2

x= -54

Answer: x= -54

6 0
3 years ago
Other questions:
  • A sunglassez store bought $5000 worth of sunglasses. The store made $9000, making a profit $20 per pair of sunglasses. There wer
    12·1 answer
  • What is the domain of the absolute value f(x) equals -.5 |X -2|-4
    15·1 answer
  • Find all the zeros of the quadratic function<br> y = x^2 - 13x + 12
    11·2 answers
  • Can someone please help me out with this math problem as soon as possible please! And thank you!
    9·1 answer
  • A Plane flies with a velocity of 52 m/s south in a 12 m/s wind blowing in the same direction. Find the
    8·1 answer
  • F:R R,f(x)=x+4 cu axa Oy
    6·1 answer
  • I PROMISE THIS IS EASY I WILL GIVE BRAINLEST!!!!!!!!11 Add or subtract.
    15·2 answers
  • Solve the Equation below : t -1/3 = 1/8 Solve for t. ​
    14·1 answer
  • A bag with 1/4 pounds of raisins will be used to fill snack cups with 1/32 pounds of raisins each. How many snack cups can be fi
    13·1 answer
  • 3 2/3 + 2.3going on?!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!