Answer:
B
Step-by-step explanation:
Mathematically, we shall be using the z-score here
Z-score = (x-mean)/SD
From the question, mean = 80 and SD = 4
So we want to get the option in the question that has a z-score of 1 or below
Let’s look at 75
80-75 = 5 ( this is clearly above 1 standard deviation of 4)
For 77;
80 -77 = 3
This is less than the standard deviation of 4, meaning it is within 1 standard deviation of the mean
700*600=420,000
420,000/10=42,000
Diameter = 25
so radius = 12.5
Pi*12.5^2=625/4Pi
42,000/625/4 Pi =86.56169741
=86.6
she can fit 86 tins
Answer:
(A) 0.15625
(B) 0.1875
(C) Can't be computed
Step-by-step explanation:
We are given that the amount of time it takes for a student to complete a statistics quiz is uniformly distributed between 32 and 64 minutes.
Let X = Amount of time taken by student to complete a statistics quiz
So, X ~ U(32 , 64)
The PDF of uniform distribution is given by;
f(X) = 
, a < X < b where a = 32 and b = 64
The CDF of Uniform distribution is P(X <= x) = 
(A) Probability that student requires more than 59 minutes to complete the quiz = P(X > 59)
P(X > 59) = 1 - P(X <= 59) = 1 - = 1 - 
= 
= 0.15625
(B) Probability that student completes the quiz in a time between 37 and 43 minutes = P(37 <= X <= 43) = P(X <= 43) - P(X < 37)
P(X <= 43) = 
= 
= 0.34375
P(X < 37) = 
= 
= 0.15625
P(37 <= X <= 43) = 0.34375 - 0.15625 = 0.1875
(C) Probability that student complete the quiz in exactly 44.74 minutes
= P(X = 44.74)
The above probability can't be computed because this is a continuous distribution and it can't give point wise probability.
Options:
A.
All survey respondents
B.
The proportion of customers who say they are satisfied with their service
C. All customers who use the drive-thru window of this fast food restaurant
D. All customers of this restaurant
Answer:A. All survey respondents
Step-by-step explanation: A population is the total number of people or a particular organism staying in a particular place or from where a sample can be gotten which is to be used for an experiment.
A survey is a research procedure used to obtain data from a pre-determined group of people,this data is about their own view about a given topic of interest in the research.
Answer:
75% students read less than 35 pages.
Step-by-step explanation:
The stem and leaf plot is given below
0 | 5 0 5 8
1 | 2 3 5 8 8 9
2 | 2 4 6 7 7 7
3 | 3 5 6
4 | 2 4 6
5 | 7
Count the students in each row.
Row 1 = 4 students
Row 2 = 6 students
Row 3 = 6 students
Row 4 = 3 students
Row 5 = 3 students
Row 6 = 1 student
Total students = 23 students
75% of 23 students = 0.75/100 · 23 = 12.25 students
75% of 23 students ≅ 17 students
From the stem and leaf plot, 17th student read 33 pages while 18th student reads 35 pages.
Which means
75% students read less than or equal to 33 pages.
OR
75% students read less than 35 pages
