Mathematics, 19.02.2020 02:46 zayt

Be my Valentine: The following frequency distribution presents the amounts, in dollars, spent for Valentine's Day gifts in a survey of 120 U. S. adults in a recent year. Approximate the mean amount spent on Valentine's Day gifts to two decimal places. Amount Frequency0-19.99 16 20.00-39.99 1340.00-59.99 21 60.00-79.99 19 80.00-99.99 12 100.00-119.99 10 120.00-139.99 7140.00-159.99 8160.00-179.99 7180,00-199.99 1200.00-219.99 3220.00-239.99 2240.00-259.99 1

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Answer from: Shazrts2371

the mean is 82.75

Step-by-step explanation:

Amount Frequency Mid Point fx

0-19.99 16 9.995 159.92

20.00-39.99 13 29.995 389.935

40.00-59.99 21 49.995 1049.895

60.00-79.99 19 69.995 1329.905

80.00-99.99 12 89.995 1079.94

100.00-119.99 10 109.995 1099.95

120.00-139.99 7 129.995 909.965

140.00-159.99 8 149.995 1199.96

160.00-179.99 7 169.995 1189.965

180,00-199.99 1 189.995 189.995

200.00-219.99 3 209.995 629. 985

220.00-239.99 2 229.995 459.99

240.00-259.99 1 249.995 240.995

∑ 120 9930.4

Mean = ∑fx/∑x

Mean = 9930.4/120=82.7533 = 82.75

Answer from: Quest

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get $6x^{2} -3x$

and solving the given expression :

3x(2x-1)

$6x^{2} -3x$

since solving the expression using tiles and solving the expression algebraically we get the same answer

thus we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

Which is true regarding armando’s use of algebra tiles? he used the algebra tiles correctly. he did

Answer from: Quest

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.

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Be my Valentine: The following frequency distribution presents the amounts, in dollars, spent for Va...

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