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antiseptic1488 [7]

2 years ago

9

The radioisotope Mo-91 has a t1/2 of 15.5min. A sample decays at the rate of 954counts/min (954cpm). After how many minutes will

the decay be at 7.45cpm? (Step by step please)

1 answer:

TiliK225 [7]2 years ago

5 0

Step-by-step explanation:

Transcribed image text: Spectra Analysis 7 100 80 60 40 20 150 50 STRUCTURE 60 40 20 0 180 160 140 120 100 8O

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12x+5=4x? Show steps, please.

gavmur [86]

Answer:

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Step-by-step explanation:

4x = 12x + 5

4x - 12x = 5

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VladimirAG [237]

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What is the standard deviation of the data set?

Temka [501]

The Standard Deviation is a measure of how spread out numbers are. Standard deviation can be calculated by the expression as follows:

s = √∑(x - x(mean))^2/n-1

x(mean) = 24

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3 years ago

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Monica [59]

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2 years ago

Question 18(Multiple Choice Worth 1 points) (01.01) Period 1 has 15 students in it and a test average of 86%. Period 2 has 21 st

andrew11 [14]

Answer:

89.125%

Step-by-step explanation:

The weighted mean is simply the multiplication of the number of student in each period times the respective average of said period, divided by the total number of students:

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2 years ago