5,401 Answered Questions for the topic probability

Probability Math Statistics

11/11/20

Statistics Question

A political candidate has asked you to conduct a poll to determine what percentage of people support her.If the candidate only wants a 6% margin of error at a 99% confidence level, what size of... more
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Probability Math Statistics

11/11/20

I need help on this question

Out of 500 people sampled, 180 had kids. Based on this, construct a 99% confidence interval for the true population proportion of people with kids. Give your answers as decimals, to three places ... more
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Probability Math Statistics

11/11/20

In a recent poll, 350 people were asked if they liked dogs, and 52% said they did. Find the margin of error of this poll, at the 99% confidence level. Give your answer to three decimals
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Probability Math Statistics

11/11/20

I need help on this question
The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 38 liters, and standard deviation of 4.4 liters.A) What is the probability that daily production... more
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Probability Math Statistics

11/11/20

Statistics Question, Read Description

In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 55.7 inches, and standard deviation of 4.8... more
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Probability Math Statistics

11/11/20

A high school baseball player has a 0.304 batting average. In one game, he gets 8 at bats. What is the probability he will get at least 6 hits in the game?
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Probability Statistics

11/10/20

Expected Value and Probability

Z -2 0 1 3 4P(z) .2 .3 .3 .1 .1Find E((z+3)(z-1))
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Probability Math Statistics

11/10/20

Test statistic statistics

You are testing the claim that the mean GPA of night students is different than the mean GPA of day students.You sample 45 night students, and the sample mean GPA is 2.03 with a standard deviation... more
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Probability Math

11/09/20

Probability of winning question
If there are 5 separate questions to pick the right answer.50% of people picked the first question right.58% of people picked the second question right.34% of people picked the third question... more
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Probability

11/09/20

Probability question
1. Let P(A)=p, P(A|B)=q, P(B|A)=r. Find the relations between the number p, q, r for the following... more
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Probability Statistics

11/09/20

DATA ANALYSIS ENGINEERING

The prevalence of a certain type of cancer among women aged 50–60 is 1 in 150. A bloodtest will be positive 98% of the time if the cancer is present, but is also positive 7% of thetime if the... more
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11/09/20

DATA ANALYSIS ENGINEERING
A male fruit fly is equally likely to carry alleles a or b on the X chromosome. Allele a is lethalfor females, so if the male fruit fly carries a, all of its offspring will be male. If the male... more
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Probability

11/09/20

About probability
Consider a Bernoulli process with probability of success 0.7. What is the probability that there are 4 l’s and 3 O's in trials 36-42?
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Probability

11/08/20

Rules of Probability
Let E, F and G be three events in S with P(E) = 0.61, P(F) = 0.47, P(G) = 0.39, P(E ∩ F) = 0.3, P(E ∩ G) = 0.2, P(F ∩ G) = 0.18, and P(E ∩ F ∩ G) = 0.08. Find P(EC ∪ FC ∪ GC).P(EC ∪ FC ∪ GC) Can't... more
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Probability

11/08/20

Suppose that events F and S are conditional independent events given D and ~D respectively with p(F|D)=p(S|D)=0.9, p(~F|~D)=p(~S|~D)=0.9, and p(D)=0.2. Find p(D|F∩S)
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Probability

11/08/20

Conditional Probability
(a)    P(EC | F) (b)    P(FC | E)Any help is appreciated thanks. 
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Probability

11/08/20

Conditional Probability
Let P(E) = 0.25, P(F) = 0.45, and P(E ∩ F) = 0.15. Draw a Venn diagram and find the conditional probabilities.(a) P(F | E ∩ F)(b) P(EC | E )Any help is appreciated thanks.
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Probability

11/08/20

Rules of Probability
Let E, F and G be three events in S with P(E) = 0.61, P(F) = 0.47, P(G) = 0.39, P(E ∩ F) = 0.3, P(E ∩ G) = 0.2, P(F ∩ G) = 0.18, and P(E ∩ F ∩ G) = 0.08. Find P(EC ∪ FC ∪ GC).P(EC ∪ FC ∪ GC) Can't... more
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Probability

11/08/20

Rules of Probability
Let S = {a, b, c, d, e, f} with P(b) = 0.11, P(c) = 0.18, P(d) = 0.23, P(e) = 0.19, and P(f) = 0.16. Let E = {c, d, e} and F = {a, b, d, e}. Find P(a), P(E), and P(F).P(a)P(E)P(F)I found P(E).... more
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Probability

11/08/20

Probability question
A and B are two weak students of statistics and their chances of solving a problem in statistics correctly are 1/6 and 1/8 respectively. If the probability of their making a common error is 1/525... more
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Probability

11/08/20

Probability question
Rahul speaks truth 4 out of 5 times. A die is tossed. He reports that there is a six. What is the chance that actually there was six? ... more
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Probability

11/08/20

Basics of Probability
A fair 4-sided die is tossed. What is the probability that the numbers 4 or 3 are tossed?Can't seem to figure it out. Any help is appreciated thanks.
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Probability Statistics

11/08/20

Probability Question
4 balls are picked at random from a box with 20 red balls, 25 black balls and 5 white balls. Let X be the number of white balls in the sample. Compute 𝑃(𝑋2 + 12 = 7𝑋).
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Probability Statistics

11/08/20

Expected cost and Probability

A store owner has overstocked a certain item and decides to use the following promotion to decrease the supply. The item has a marked price of $100. For each customer purchasing the item during a... more
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Probability Statistics

11/08/20

Statistics, Probability

In a certain country, 40% of the population has covid-19. If one person at a time is selected at random, what is the probability that The 1st person found with covid-19 is the 5th person... more
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