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sladkih [1.3K]
3 years ago
8

PLEASE HELP ME. A bacteria is tripling every 10 days. If there is 4 bacteria in a sample, how long will it take to reach 1 milli

on bacteria? What formula did you use? Approximate and exact answer please.​
Mathematics
1 answer:
serg [7]3 years ago
4 0

Answer:

Step-by-step explanatiNlo peral son  en

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In a pizza takeout restaurant, the following probability distribution was obtained for the number of toppings ordered on a large
Elis [28]

Answer:

The random variable (number of toppings ordered on a large pizza) has a mean of 1.14 and a standard deviation of 1.04.

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>The probability distribution is:</em>

<em>x   P(x) </em>

<em> 0   0.30 </em>

<em>1    0.40 </em>

<em>2   0.20 </em>

<em>3   0.06 </em>

<em>4   0.04</em>

The mean can be calculated as:

M=\sum p_iX_i=0.3\cdot 0+0.4\cdot 1+0.2\cdot 2+0.06\cdot 3+0.04\cdot 4\\\\M=0+0.4+0.4+0.18+0.16\\\\M=1.14

(pi is the probability of each class, Xi is the number of topping in each class)

The standard deviation is calculated as:

s=\sqrt{\sum p_i(X_i-M)^2}\\\\s=\sqrt{0.3(0-1.14)^2+0.4(1-1.14)^2+0.2(2-1.14)^2+0.06(3-1.14)^2+0.04(4-1.14)^2}\\\\s=\sqrt{0.3(-1.14)^2+0.4(-0.14)^2+0.2(0.86)^2+0.06(1.86)^2+0.04(2.86)^2}\\\\ s=\sqrt{0.3(1.2996)+0.4(0.0196)+0.2(0.7396)+0.06(3.4596)+0.04(8.1796)}\\\\s=\sqrt{0.3899+0.0078+0.1479+0.2076+0.3272}\\\\ s=\sqrt{ 1.0804 }\\\\s\approx 1.04

3 0
2 years ago
Find the mid segment of GH
noname [10]

Answer:

B. 2

Step-by-step explanation:

Based on the Midsegment of a trapezoid theorem:

GH = (BC + FE)/2

9x - 3 = (19 + (5x + 1))/2) (substitution)

9x - 3 = (20 + 5x)/2

Cross multiply

2(9x - 3) = 20 + 5x

18x - 6 = 20 + 5x

Collect like terms

18x - 5x = 20 + 6

13x = 26

Divide both sides by 13

x = 26/13

x = 2

8 0
3 years ago
Which description can be written as the expression StartFraction 8 Over 21 n EndFraction?
frutty [35]

Answer: It is the quotient of 21 times and number and 8.

5 0
3 years ago
There are 45 boys and 60 girls in Year 6. What is the ratio of boys to girls? Write the ratio in the simplest form
exis [7]
The answer to this is 3:4
6 0
3 years ago
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42 is 21% of what number?
Margarita [4]
42 is 21% of 200. This is because 200*0.21 = 42.
8 0
3 years ago
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