Please provide clear, step by step answers. Thank you!!! Careless Caroline break
ID: 2887647 • Letter: P
Question
Please provide clear, step by step answers. Thank you!!!
Careless Caroline breaks, on average, 15% of the lab equipment that she touches each semester. If each student is issued a set of 30 pieces of lab equipment at the start of the semester, find the prob that Caroline breaks exactly 6 pieces this semester. 4 a (b) The total number of pipettes broken by chemistry students each semesteris a mean of 10. There were just 3 broken pipettes this semester- fewer than nrmally di Determine the standard deviation 95% of all other semesters.Explanation / Answer
6 (a)
It is given that total number of pieces given to each student in each semester is 30.
And the avergage 15% of 30 is to broke by Caroline that iss: (15*30)/100 = 4.5 => 5 pieces
Probability for exactly 6 pieces to be broken be her would be: 0/30 = 0
(b) Mean = 10
Total number of pipette beaker / Total number of students = 10
No. of beakers pipette = 3
Percentage of unvroken fewer pipettes = 95%.
.i.e. 5% are broken pipette = 3
Total number of pipette be let x, then:
(3/x)*100 = 5
x = 60.
Total number of students => 60/10 = > 6
Standard Deviation = sq. root((10-6)^2/60) => root(16/60) = 0.516
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