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crimeas [40]
3 years ago
10

Can 7 go into 42 and 91

Mathematics
2 answers:
Vinvika [58]3 years ago
8 0
Yes. Because 7 time 6 is 42, and 7 time 13 is 91
Misha Larkins [42]3 years ago
7 0
7 times 6 is 42
91 divided by 7 is 13
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Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American a
spin [16.1K]

Answer:

Mean = 68.9

s^2 =18.1 --- Variance

Step-by-step explanation:

Given

\begin{array}{cccccc}{Class} & {51-58} & {59-66} & {67-74} & {75-82} & {83-90} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}

Solving (a): Calculate the mean.

The given data is a grouped data. So, first we calculate the class midpoint (x)

For 51 - 58.

x = \frac{1}{2}(51+58) = \frac{1}{2}(109) = 54.5

For 59 - 66

x = \frac{1}{2}(59+66) = \frac{1}{2}(125) = 62.5

For 67 - 74

x = \frac{1}{2}(67+74) = \frac{1}{2}(141) = 70.5

For 75 - 82

x = \frac{1}{2}(75+82) = \frac{1}{2}(157) = 78.5

For 83 - 90

x = \frac{1}{2}(83+90) = \frac{1}{2}(173) = 86.5

So, the table becomes:

\begin{array}{cccccc}{x} & {54.5} & {62.5} & {70.5} & {78.5} & {86.5} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}

The mean is then calculated as:

Mean = \frac{\sum fx}{\sum f}

Mean = \frac{54.5*4+62.5*3+70.5*11+78.5*13+86.5*4}{6+3+11+13+4}

Mean = \frac{2547.5}{37}

Mean = 68.9 -- approximated

Solving (b): The sample variance:

This is calculated as:

s^2 =\frac{\sum (x - \overline x)^2}{\sum f - 1}

So, we have:

s^2 =\frac{(54.5-68.9)^2+(62.5-68.9)^2+(70.5-68.9)^2+(78.5-68.9)^2+(86.5-68.9)^2}{37 - 1}

s^2 =\frac{652.8}{36}

s^2 =18.1 -- approximated

5 0
2 years ago
HELP ASAP WILL GIVE BRAINLY
Mila [183]

Answer:

1 and 2 are not polyhedrons, as a circle has infinite sides

1. cone, 1 vertex

2. sphere, nothing

3. pentagonal prism?

wait but can't every face be a base???

anyway 7 faces, 10 vertices

4. triangular prism

5 faces, 6 vertices

Step-by-step explanation:

8 0
3 years ago
Paul made 7 homemade pizzas. He used 3/4 of a cup of sauce for each pizza. How many cups of sauce did he use altogether?
hodyreva [135]

Answer:

5 1/4 cups

Step-by-step explanation:

7x3/4= 5 1/4

8 0
2 years ago
I got more questions
Liono4ka [1.6K]

Answer:

a,d,c

Step-by-step explanation:

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2 years ago
How to calculate fifteen percent of 4,000,751,546,368?
Pavlova-9 [17]
15% of 4,000,751,546,368= 15/100x4,000,751,546,368 = 600,112,731,955.6
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3 years ago
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