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Chapter 2 Stat
Chapter 2 Stat
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#math#APstat#Chapter2
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1
The _______ of a skewed curve is located further toward the long tail than the ______ is.
D: σ, µ
C: µ, σ
B: median, µ
A: µ, median
2
14. What is the point that the µ of a density curve?
C: µ
A: Median
D: Balance point
B: Equal-areas point.
3
The average rainfall have µ =57 inches.what is the σ If exceeds 60.67 inches in 14% ?
D: the σ cannot be computed from the given information.
C: 2.8 inches
A: 3.4 inches
B: 5.2 inches
4
Which property is not belong to Normal curves?
B: The µ control the spread of a Normal curve.
A: completely described by the µ and σ
5
µ=50 hours& σ= 15 hours. the probability that the length of time will be between 50 and 70 h.
B: 0.4082.
C: 0.521
A: 0.268
D: 0.2571
6
Which of following statement is falas?
relative frequency,rat number in the interval tototal number
All of the answer id true.
cumulative frequency=total frequency less than upper limit
cumulativerelativefrequency=rat cumulativefrequency/total #
7
The average rainfall have µ=57 inches.what is the σ If exceeds 60.67 inches in 14% of the year?
B: 5.2 inches
C: 2.8 inches
A: 3.4 inches
D: the σ cannot be computed from the given information.
8
the heights of 3-year-old males have a µ 96.5 cm and σ of 3.5 cm. the third quartile?
94.1 cm
99.1 cm
98.8 cm
96.3cm
9
µ= 500 & σ= 100. score must better than at least 70% ,Jamescores=585. Will he be admitted
D: NO, NO encough information to get the P.
B: NO, His scores is too low.
A: Yes, the probability is 80.23%
C: Yes, HIs score is higher than 80.34% of all people.
10
The distribution have theµ=9.5ounces and σ=0.03 ounces. what weighs do the middle 68%of bags?
A: 9.53-9.59
B: 9.44-9.47
C: 9.47-9.53
D. 9.47-9.5
11
Which of the following is least likely to have a nearly Normal distribution?
B: IQ scores of all students in the Statistics class.
The weights of all female students in the Statistics class.
C: Family income of all students in the Statistics class.
D: All of a-c will be approximately Normal.
12
Which of following statement is falas?
normal curves have symmetric, single-peaked, bell-shaped.
Change µ no σ moves the Normal curve the horizontal axis.
the standard diviation cannot be estimated by the graph.
The σ controls the spread of a Normal curve.
13
The mean=75 grams,standard deviation= 2 grams. what percent have the weights between 75 and 79?
47.5%
13.5%
68%
34%
14
Approximately _% of the observations fall within 2σ of mean in a Normal distribution?
68%
96%
99.7%
95%
15
Which of following is the µ and standard diviation of this normal curves?
D: µ = 5, σ = 2
A: µ = 4, σ = 1
B:. µ = 15, σ = 3
C: µ = 4, σ = 0.5
16
µ =9.5 ounces and σ= 0.03 ounces. A 9-ounce bag that weighs 9.47 ounces is at what percentile?
12.89%
15.87%
84.13%
17.1%
