Carriepruitt

26.04.2020 • 

Mathematics

Use the normal distribution to the right to answer the questions. (a) What percent of the scores are less than 19? (b) Out of 1500 randomly selected scores, about how many would be expected to be greater than 21? Standardized Test Composite Scores 19 21 Score mu equals 19.5sigma equals 5.3mu x A graph titled "Standardized Test Composite Scores" has a horizontal x-axis labeled "Score" from about 1 to 38 with tick marks at 19 and 21. A normal curve labeled μ = 19.5 σ = 5.3 is centerUse the normal distribution to the right to answer the questions.
(a) What percent of the scores are less than 19?
(b) Out of 1500 randomly selected scores, about how many would be expected to be greater than 21?
Standardized Test Composite Scores
19
21
Score
mu equals 19.5sigma equals 5.3mu
x

A graph titled "Standardized Test Composite Scores" has a horizontal x-axis labeled "Score" from about 1 to 38 with tick marks at 19 and 21. A normal curve labeled μ = 19.5 σ = 5.3 is centered above the x-axis at 19.5. A vertical line segment labeled μ extends from the normal curve to the x-axis at 19.5.
(a) The percent of scores that are less than 19 is
nothing%.
(Round to two decimal places as needed.)
Enter your answer in the answer box and then click Check Answer.ed above the x-axis at 19.5. A vertical line segment labeled μ extends from the normal curve to the x-axis at 19.5. (a) The percent of scores that are less than 19 is nothing%. (Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer.

Ответ:

Tirone

01.09.2021

Mathematics

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answer: the missing part will ab and cd are congruent by sas postulate.

explanation: according to the question here, a quadrilateral abcd in which o is the point at which the diagonals ac and bd cut each other. and, and are the angles of triangles aob and cod respectively.

now the theorem is " if the diagonals of a quadrilateral bisect each other, the quadrilateral is a parallelogram"

so, according to melissa's proof- for triangles aob and cod, angle 1 is equal to angle 2 as they are vertical angles.

ao = oc and bo = od because it is given that diagonals bisect each other.

the ab and cd are congruent by sas postulates.

similarly, triangles aod and cob are congruent.  

by cpctc, ab is equal to dc.  

by cpctc, ad is equal to bc.  

as the opposite sides are congruent the quadrilateral abcd is a parallelogram.

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