# Posts by PsyDAG

Total # Posts: 23,511

**Statistical concept 68-95-99.7**

Don't repeat posts. It wastes our time responding to them. See your later post.

**Maths!**

Lacking data. How many colors/marbles?

**Stat**

Z = (score-mean)/SD Use table labeled area under normal distribution in the back of your text. Either-or probabilities found by adding individual probabilities. Both probabilities found by multiplying individual probabilities.

**3rd grade math**

Yes

**MATH**

A more exact answer to cups = 5/(5+1+3+2) = 5 /11 = .45

**MATH**

3/(6+1+2+3) = ?

**MATH!**

Boys< 30-16

**MATH**

Without the outlier, the mean (which functions as a balance point) would be lower.

**math**

2/5 * 150 = ?

**Math**

54/(7+2) = 6 Multiply the 7 and 2 by 6.

**Math**

See your later post.

**Math**

Second and third choices are correct. The correlation would only show straight line if there was perfect predictability (+1.00) for the positive trend.

**math**

2 * 3= ? 10 * 15 = ?

**stats**

Z = (52-50)/SEm SEm = SD/sqrt n Look up Z in table in back of your text labeled area under normal distribution.

**math**

Why do you divide the width by 4? Is That because the length is 1/4W?

**math**

You do not state relationship between width and length.

**Maths**

What is your question?

**Math**

Probability of 2 or more independent events occurring is found by multiplying the individual events Assuming replacement, P(both) = .08 * .08 At least one = one or two. Either-or probabilities are found by adding the individual probabilities. P(one) = .08 * .92 P(both) shown ...

**math**

Let X = tens and y = twenties X = 7 - y 10 X + 20 y = 100 Substitute 7-y for X in the second equation and solve for y, then use first equation to find x.

**math help pls pls pls**

0 no correlation

**math**

5/(30+12+5)=?

**MaThS LITERACY; GEOGRAPHY;TOURISM AND ECONOMIC**

Consult with your school counselor,who can help you estimate your interests and abilities and the occupations they relate to.

**Algebra**

P.S. It is better to indicate specific topic in subject space to get a tutor who knows the subject. You lucked out this time.

**School**

B = 3C 2B + 4C = 30 Substitute 3C for B in the second equation to solve for C, then insert value in the first equation to find B.

**math**

(1-.10)X = 36 Solve for x.

**math**

2*24*2 minutes less.

**Math**

Cannot drag on these posts.

**math**

1/2 + 1/6 = 6/12 + 2/12 = 8/12 = 2/3 Neither do I. Probably a typo in the answer key.

**Maths**

(4 * 2) +1 = 9

**Math needs help**

Indicate specific topic so tutor with the right knowledge will respond.

**Math**

(12 - 7)/12 = ?

**English**

What is your question?

**English**

Either

**Bio**

Haploid

**Scince**

What are your choices?

**maths littercy ,agricultural science ,life science ,tourism , life orientatiom, ndebele and english**

Consult your school counselor, who can help you assess your abilities and interests along with recommending schools that will fit your needs.

**stats**

No data set. You can't copy and paste here.

**history,maths literacey,english,xitsonga,religion,**

Contact your school counselor.

**Statistic**

What is your question?

**dramatic art .tourism. history and math lit**

Contact your school counselor with this question.

**Elementary Statistics**

Z = (score-mean)/SEm SEm = SD/sqrt n Use same table.

**Algebra**

Let X = initiation fee X + 18m = 3950 X + 7m = 3125 Subtract second equation from first to solve for m. Insert value into either equation to solve for X.

**science help pls pls**

Under changing conditions

**science help pls pls**

Hydro- = water Geo- = ground

**i really need help with science pls help**

Disagree.

**science help pls pls pls**

Dwarf planet

**algebra**

We cannot measure your subjects to get the data.

**Algebra**

You did a good job. What's your confusion?

**math**

(1-7/8)*12 = ?

**i really need help with science pls help**

No diagram. Can't copy and paste here.

**Math**

Either-or probabilities are added. 10/20 + 3/20 + 5/20 = ?

**Stats - Help!!!**

Disagree.

**Stats - Help!!!**

Agree.

**Stats - Help!!!**

Agree with second choice.

**Stats - Help!!!**

Need goal before sample.

**Maths Lit, Geography, English, LO, EGD, Afr.**

Consult your school counselor who can help you define your goals according to your abilities and interests.

**math**

A = 6/8S 6A + 8S = 60 Substitute 6/8S for A in second equation and solve for S. Then use first equation to find A.

**math**

See your later post.

**Stats**

Since assignment is random, it is not C.

**Stats**

Agree. The blind condition will reduce probability of Jimenez treating them different.

**stats**

Use "areas under normal distribution" table in the back of your statistics text.

**science (correct please)**

2, 4 are wrong. The rest are right.

**Statistics**

Don't repeat questions. It wastes our time responding to multiples. See your later post.

**Science**

1. Styrofoam insulates, copper conducts. 2. Warm air rises.

**Urns and $ - Pre-Algebra**

P (both) found by multiplying them. 1. P(red,red) = 12/20*8/13 = ? 2. P(1,10) = 5/18 * 6/(18-1) = ?

**Physics needs help**

Indicate specific area in subject heading.

**Math**

No parts shown. Cannot copy and paste here.

**Algebra (Correction)**

J + D + K = 320 Solve for D, then K.

**Algebra**

J = D + 20 K = D/2 J + D + K = ? (D+20) + D + D/2 = ?

**Mathematics**

We don't do your work for you. However, we will be glad to respond to your answers. Consult your text.

**Health Plz help THX!!**

Oxygen correct. Others unanswered or wrong. Seems like you are just guessing. Use your textbook.

**science PLEASE CHECK MY ANSWERS**

Disagree with first answer but not sure about second but guess at cast.

**7th Grade Science**

Those variations (mutations) that lead to survival in the environment continue. If not, those go to extinction.

**science**

Different, gas, solid or liquid. You supply why.

**biology**

The sperm and egg are each haploid.

**Statistic**

OK

**Statistics**

5,352/100,000 = ?

**Statistics**

26*26*10^3 = ?

**Math**

Any value to the zero power = 1

**Math**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

**math**

let x = fiction books. 3x + x = 2000 Solve for x then 3x.

**Math**

From your info: 2/4 = x/8 Solve for x.

**Math**

5 + .10k > 1 + .50k Solve for k.

**math**

9.5 * 2/3 = ?

**math**

Unclear about the meaning of 6 1.

**math**

24/15 = x/18 Solve for x.

**math**

260/13 = 20 8(20) + 5(20) = 260 Can you work it from there?

**Math**

57(1.08) = ?

**math**

1. If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. I. (50/90)^2 = ? II. Generalize from I. III. (50/90)(40/90) = ? 2. Either-or probabilities are found by adding the individual...

**Math**

$450 * 52 = ? Assuming that "tax" was inserted in error: [$115(52) + .095($125,000)/52] = ? Subtract one from the other.

**Mathematics**

No, did you try the other alternatives? -1 = 2(-2) + 1 = -3

**Mathematics**

Disagree.

**statistics**

Need to know mean and standard deviation. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the two Z scores.

**Math (???)**

No table.

**science**

2 is my preference.

**Maths, life science,business studies, EGD, LO and**

Consult with your school counselor, who can help you evaluate your interests and abilities.

**Biology**

agree.

**math**

Let x = width 3/6 = x/15 Solve for x and then multiply by length.

**maths (??)**

Points not given here.

**algebra**

a + 7c = 62 2a + 8c = 79 Multiply first equation by 2 and then subtract the second equation from it.