Questions on Algebra: Probability and statistics answered by real tutors!

Tutors Answer Your Questions about Probability-and-statistics (FREE)

Question 474151: between z= -1.56 and z=-1.83
to the right of z = -0.18
to the left of z= 2.16
to the right of z = 1.98 and to the left of z= -0.59
Click here to see answer by edjones(7569)

Question 474158: Two cards are drawn from a standard deck of 52 where the first card is NOT replaced before the second card is drawn. Find the probability that both cards are face cards (jack, queen, or king).
a. 9/2704
b. 9/676
c. 11/221
d. 9/169
Pick a card from a deck of cards, keep it and select a second card. If Event A is the selection of the first card and Event B is the selection of the second card, Events A and B are:
a. dependent
b. independent
c. neither dependent nor independent

Click here to see answer by ewatrrr(10682)

Question 474204: there is an 80% chance that a prospective employer will check the educational background of a job applicant. For 100 randomly selected job applicants, find the probability that exactly 85 have their educational backgrounds checked.
Click here to see answer by stanbon(57984)

Question 474197: 33% of adults say cashews are their favorite kind of nut. You randomly select 12 adults and ask each to name his or her favorite. F ind the probability that the number who say cashews are their favorite nut is (a) exactly three, (b) at least four, and (c) at most tow. If convenient use technology to find the probabilities.
(a) P(3)= round to the nearest thousandth as needed
(b) P(x>_4)= round to the nearest thousandth as needed.
(c) P(x_<2) = round to the nearest thousandth as needed.
Thank you.
Click here to see answer by solver91311(17077)

Question 474201: Mars Inc, claims 24% of M&M plain candies are blue. Suppose that a sample of 100 M&Ms are randomly selected and 27 are found to be blue. Assuming the claimed blue M&Ms rate of 24% is correct, find the probility of randomly selecting 100 M&Ms and getting 27 or more that are blue. Based on your result, is 27 an unusually high number of blue M&Ms when 100 are randomly selected?
Click here to see answer by edjones(7569)

Question 474198: Which of the following statistics are unbiased estimators of population parameters?
a. sample mean used to estimate a population mean
b. sample median used to estimate a population median
c. sample range used to estimate a population range
Click here to see answer by edjones(7569)

Question 474218: find the probability that the given voltage is between 123.2 volts and 124.7 volts in a sample drawn from a uniformly distributed population having range from 123.0 volts to 125.0 volts
Click here to see answer by stanbon(57984)

Question 474194: A slot machine is configured so that there is a 1/2000 probability of winning the jackpot on any individual trial. Suppose a guest claims that she played the slot machine 5 times and hit the jackpot twice. Find the probability of exactly 2 jackpots in 5 trials. find the probability of at least 2 jackpots in 5 trials. does the guest's claim of hitting 2 jackpots in 5 trials seem valid?
Click here to see answer by edjones(7569)

Question 474315: A card is drawn at random from a deck of 52 playing cards. Find the
probability that it is a club or a king.
Click here to see answer by stanbon(57984)

Question 474315: A card is drawn at random from a deck of 52 playing cards. Find the
probability that it is a club or a king.
Click here to see answer by jorel1380(2518)

Question 474325: 1/In a recent poll by the american automobile club 40% of the surveyed said that they were worried about aggressive drivers. If 3 people are randomly selected, what is the probability that all 3 will be worried about aggressive driveres
2/ a container has 5 blue marbles, 3 red marbles, and 6 white marbles. If 3 marbles are drawn with replacement, what is the probability that all three will be blue?
3/ In how many ways can the letters in "chapter" be arranged
4/ two dice are rolled. Find the probability of getting a sum of 6
5/ A password of 3 letters must be selected. If the letters may be repeated, how many 3 letter password will be possible

Click here to see answer by stanbon(57984)

Question 474338: 6/ a poll states that 30% of the workers in a large company have new desk, If 4 workers are selected at random, what is the probability that a least one workers has a new desk
7/ In a shipment of 30 televisions, 4 are defective, if 2 television sets are randomly selected and tested without replacement, what is the probability that both are defective.

8/ At one time, Powerball required picking five number from 1to 55 and one number for the powerball from 1-to 42 must be selected. In how many ways can these 6 numbers be selected?

Click here to see answer by jorel1380(2518)

Question 474328: The measure of position called the midquartile of a data set is found using the formula Q1 + Q3/2
Find the midquartile of the given data set.
23 37 47 32 33 41 40 25 31 22 39 42
Click here to see answer by robertb(4012)

Question 474287: Determine if this statistical study is descriptive or inferential:
A study finds that 51% of registered voters favor candidate X over candidate and why
Thank you
Click here to see answer by robertb(4012)

Question 474388: the time taken by the electronic device in a car to respond to a signal from the toll plazza is normally distributed with mean 160 microseconds and standard deviation 30 microseconds. Calculate the probability that the device in the car will respond to the given signal, that is in less than 148 microseconds and within 100 and 180 microseconds.
Click here to see answer by robertb(4012)

Question 474387: Past statistics show that a football team scores an average of 3 goals per match. Use a Poisson distribution to find the probability that the team would score exactly 4 goals in a match and at most 2 goals in a match.
Click here to see answer by robertb(4012)

Question 474447: Tanisha does not own a convertible or Joan does not own a Volvo
Translate each statement into symbols. Then construct a truth table for each and indicate under what conditions the compound statement is true.
Click here to see answer by Theo(3504)

Question 474457: The odds in favor of an earthquake are 5 to 1. What is the probability that an earthquake will occur?
Click here to see answer by stanbon(57984)

Question 474454: A lottery game has balls numbered 1 through 17. What is the probability of selecting an even numbered ball or 4?
Click here to see answer by stanbon(57984)

Question 474450: find the indicated probability using the standard normal distribution. P(z>1.99)
Click here to see answer by stanbon(57984)

Question 474496: a card is randomly selected from a standard deck of 52 cards. What is the probability that it is an 8 or a king?

When two fair coins are tossed, there are four possible outcomes.
What is the probability that two heads are tossed?
10.
If P(A) = 0.28, P(B) = 0.41, and P(A and B) = 0.16, what is P(A or B)?
If P(A) = 0.7, P(B) = 0.4, and P(A or B) = 0.8, what is P(A and B)?
Click here to see answer by stanbon(57984)

Question 474444: The bonfire is not burning, however the tent is pitched.
Write the statement in symbolic form
Click here to see answer by mananth(12270)

Question 474485: In a sample of 600 students, 150 are seniors. If two students are selected at random from the sample, find the probability both students are seniors.

Click here to see answer by htmentor(809)

Question 474529: Determine if this is an example of probability or statistics:
With four selections for the answer, there is a 25% chance of guessing the correct answer.

Click here to see answer by richard1234(5390)

Question 474574: Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.
a. 0.500
b. 0.159
c. 0.162
d. 0.155

Click here to see answer by Edwin McCravy(8999)

Question 474672: Find a z-score such that 14 percent of the area under the standard normal curve is above that score.
z=?
Round to nearest tenth
Click here to see answer by stanbon(57984)

Question 474697: There are 30 fish in a pond. We know that 10 of these fish are males, 4 of these males are salmon and there are 7 salmon in the pond. What is the probability that a randomly chosen fish is a salmon, given that it is male?
1/3+2/15=7/15?
Click here to see answer by stanbon(57984)

Question 474695: Two marbles are drawn without being replaced from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability when one marble drawn is white and one is blue.
Click here to see answer by jorel1380(2518)

Question 474715: Not really sure if this is correct determine if this is an example of a variable or parameter:SAT score My asnwer is variable am I correct
Click here to see answer by rfer(12731)

Question 474736: Nationally, about 11% of the total US wheat crop is destroyed each year by hail. At 37 randomly selected farms in Weld County Co, 12.5% of the crop was destroyed. a) At the alpha =.05 level, does this indicate that this damage should be considered unusual? b.) How about at the alpha=0.01 level? Sample standard deviation =5%.
Please help me.
Click here to see answer by stanbon(57984)

Question 474724: probability At most 1 queen
Click here to see answer by richard1234(5390)

Question 474853: Claim: The majority of college students have credit cards. Write the correct symbolic form for H0 and H1
Click here to see answer by robertb(4012)

Question 474851: Claim: The proportion of people aged 18 to 25 who currently use illicit drugs is equal to 20%. Write the correct symbolic form from H0 and H1
Click here to see answer by robertb(4012)

Question 474901: in 2 successive throws of pair of dice ,determine rhe second card is red queen
Click here to see answer by richard1234(5390)

Question 474843: Find the sample size necessary to achieve the following:Margin of error E=0.005, confidence level=99%, when the p is unknown. Again, assume this is an estimation of th population proportoin
Click here to see answer by robertb(4012)

Question 474915: Nine people are going on a skiing trip in 3 cars that will hold 2, 4, and 5 passengers, respectively. How many ways is it possible to transport the 9 people to the ski lodge using all cars?
Click here to see answer by Edwin McCravy(8999)

Question 474884: A game involves tossing two coins. A player wins $1.00 if both tosses result in heads. What should you pay to play this game in order to make it a fair game? Explain your answer.
Click here to see answer by Edwin McCravy(8999)

Question 474981: I'm having trouble coming about this problem:

"A bag contains red, blue, and yellow blocks. Daniel chooses a block at random, writes down the color, and puts the block back in the bag. He repeats this experiment a total of 50 times, with the following results.
Color: Frequency:
Red 18
Blue 12
Yellow 20
Estimate the probability of choosing a red block. Write your answer as a decimal."
Click here to see answer by stanbon(57984)

Question 475048: I need help with Type I and Type II error. Explain a factor that the researcher can control to change the Type I error. Explain a factor that the researcher can control to change the Type II error.
I am not understanding how to respond to this.
Click here to see answer by MathLover1(6815)

Question 475110: Write the statement in symbols using the p and q given below. Then construct a truth table for the "symbolic statement"
p = The forest is dark

q = The moon is full.
The forest is dark or the moon is full.
Click here to see answer by Edwin McCravy(8999)

Question 475120: Can someone help me solve this. This is as far as I got
N=6, P=0.34, q=0.66
X=0, 1,2,3,4,5,6,
P(0)= 6C0(0.34)^0*(0.66)^6
P(1)=6C1(0.34)^1*(0.66)^5
P(2)=6C2(0.34)^2*(0.66)^4
P(3)=6C3(0.34)^3*(0.66)^3
P(4)=6C4(0.34)^4*(0.66)^2
P(5)=6C5(0.34)^5*(0.66)^1
P(6)=7C6(0.34)^5*(0.66)^0
I don’t know what I am doing wrong, please help me!
Thank you

Click here to see answer by Tatiana_Stebko(1326)

Question 475135: the probability that person will pass A is 5/8 and the probability of person B will pass is 6/7. assume the events are independent. find the probability that at least one will pass
Click here to see answer by jim_thompson5910(28717)

Question 475144: A bag contains 7 red chips and 10 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that both chips are red?
Click here to see answer by jim_thompson5910(28717)

Question 475108: Let p represent a true statement, while q and r represent false statements. Find the truth value of the compound statement.
(~p (upside down V)~q) V r

0 True
0 False
Click here to see answer by MathLover1(6815)

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