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3 years ago

A set of data consists of 38 observations. how many classes would you recommend for the frequency distribution

Mathematics

1 answer:

storchak [24]3 years ago

6 0

solution:

use 2 to the k rule:

2⁵= 32

32 is less than 38,

so,

5 classes are not enough

try the next highest number:

2⁶ = 64

64 is greater than 38 ,

so,

the recommended number of class is 6.

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Suppose that a box contains 7 cameras and that 5 of them are defective. A sample of 2 cameras is selected at random without repl

irinina [24]

Answer:

E(x) = 1.43 (Approx)

Step-by-step explanation:

Given:

Total number of camera = 7

Defective camera = 5

Sample selected = 2

Computation:

when x = 0

P(x=0) = 2/7 × 1/6 = 2/42

P(x=1) = [2/7 × 5/6] + [5/7 × 2/6] = 20/42

P(x=2) = 5/7 × 4/6 = 20/42

So,

E(x) = [0×2/42] + [1×20/42] + [2×20/42]

E(x) = 1.43 (Approx)

8 0

3 years ago

No Tessa and Kari are swimming

Mamont248 [21]

Answer:

what is the question?

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

Read the instructions

nordsb [41]

Answer:

Step-by-step explanation:

$\frac{5x - 2}{4}+\frac{1}{2}=\frac{3y+2}{2}$

Multiply the equation by 4

$4*\frac{5x - 2}{4}+4*\frac{1}{2}=4*\frac{3y+2}{2}\\$

5x - 2 + 2 = 2*(3y + 2)

5x +0 = 2*3y + 2*2

5x = 6y + 4

5x - 6y = 4 --------------------(I)

$\frac{7y+3}{3}=\frac{x}{2}+\frac{7}{3}\\$

Multiply the equation by 6

$6*\frac{7y+3}{3}=6*\frac{x}{2}+6*\frac{7}{3}\\$

2*(7y + 3) = 3x + 2*7

14y + 6 = 3x + 14

14y = 3x + 14 - 6

14y = 3x + 8

-3x + 14y = 8 ------------------------(II)

Multiply equation (I) by 3 and equation (II) by 5 and then add

(I)*3 15x - 18y = 12

(II)*5 <u>-15x + 70y = 40</u> {Now add}

52y = 52

y = 52/52

y = 1

Substitute y =1 in equation (I)

5x - 6*1 = 4

5x - 6 = 4

5x = 4 +6

5x = 10

x = 10/5

x = 2

7 0

3 years ago

The circumference of a tennis ball is 21<br>cm. How many inches is the circumference?

Arturiano [62]

Answer:

8.26772

Step-by-step explanation:

1 centimeter is equaled to 0.393701 in inches so multiply it by 21

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3 years ago

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You own an electronics store with a merchandise book value of $245,000. You conduct a physical inventory and find the value to b

Aleksandr-060686 [28]

0.22% shrinkage as a percent of sales.

To calculate shrinkage you subtract the physical inventory value from the book value.

245,000-237,000 = 800

The shrinkage was $800. To find the shrinkage as a percent of sales take the shrinkage value and divide it by the sales value to get shrinkage as a percentage of sales.

800 / 360,000 = 0.0022....

Multiply Decimal by 100 to get the percentage

100 * 0.0022.... = 0.22%

8 0

3 years ago