##### STA2023 STATISTICS

0
Set Details Share
created 2 years ago by josie003
457 views
Elementary Statistics
updated 2 years ago by josie003
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
1

The table to the right lists probabilities for the corresponding numbers of girls in three births. What is the random​ variable, what are its possible​ values, and are its values​ numerical?

Number_of_girls P(x)
0 0.125
1 0.375
2 0.375
3 0.125

Answer.The random variable is​ x, which is the number of girls in three births. The possible values of x are​ 0, 1,​ 2, and 3. The values of the random value x are numerical.

2

Five males with a particular genetic disorder have one child each. The random variable x is the number of children among the five who inherit the genetic disorder. Determine whether the table describes a probability distribution. If it​ does, find the mean and standard deviation.

x P(x)
0 0.2373
1 0.3955
2 0.2637
3 0.0879
4 0.0146
5 0.0010

m=1.3

random variable x=1

3

ed is not particularly creative. He uses the pickup line​ "If I could rearrange the​ alphabet, I'd put U and I​ together." The random variable x is the number of girls Ted approaches before encountering one who reacts positively. Determine whether the table describes a probability distribution. If it​does, find its mean and standard deviation.

x P(x)
1 0.002
2 0.033
3 0.138
4 0.216
5 0.402

The table is not a probability distribution.

4

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.47. The table on the right describes the probability of having x number of girls. Determine whether the table describes a probability distribution. If it​ does, find the mean and standard deviation. Is it unusual for a family of three children to consist of three​girls?

x P(x)
0 0.149
1 0.396
2 0.351
3 0.104

1. Find the mean of the random variable. Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice.

• Mean=1.41

2. Find the standard deviation of the random variable. Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice.

• SD=.86

3. Is it unusual for a family with three children to have only​ girls?

• ​No, because the probability of having 3 girls is greater than greater than 0.05.

## Related pages

ich gcp questions and answers3 gorges dam case studyear light reflexdefine guard cellsinterrogative expressionswhat is the functional group of acetic acidultrasound transducer frequencyfraction and decimal equivalentschapter 22 descent with modificationclot destructionbone ossification stepskm formula enzymesilicon mass numberthe core of reality therapy consists ofstarting codonloin and groinrottgen pieta historyperiodic table flash cardsosmoregulation in marine and freshwater fishdifference between cellulose and starchwater vascular system in starfishic in medical terminologycontains its own dna and ribosomesroot words in medical terminologywhat stimulates the hypothalamusfunctional independence measure scoring3-ethyl-3-hexanoldigestive system fill in the blankwhat is costophrenicabacus flash cardsimportance of acids and bases in the human bodybrings deoxygenated blood to the lungsanimal phyla quizgrowth plate remnantasl uncleabbreviation for states mapheadright system significancemastering apmendel's principle of independent assortmentoverview of the skeleton bone markingswhat is 1900 hours in military timewhich cells produce androgens such as testosteroneendocrine anatomy quizterm for biceps brachii during elbow flexionanswer ovulationcriteria for mddwhat kind of tissue makes up the intervertebral discstransverse tubulesmyocardium anatomychapter 14 microbiology quizletwhere are the lymph nodes most denseurinary tract infection exercisedeath of a salesman charactersthoraic cagewhat organ releases glucosepepsin is a digestive enzyme thatexplain the mechanism of nerve impulse transmission at the synapseanatomy and physiology final examorganism whose cells contain nucleibone marking quizwhat color tube for electrolyteswhat percentage of energy is lost at each trophic levelfrederick douglass apushthe leading and the lagging strands differ in thatletter abbreviations for amino acidscushing triad vital signsclassify each of the bones in the chartformal organization sociologytrna transfers amino acids duringsentences for vocab wordsmajor systemic arteriescarbohydrate absorption and digestionsuperior and middle nasal conchae formed from its projectionsintroduction to medical terminology chapter 1