Statistics and Probability Answers

Which of the following variables are quantitative and which are qualitative. Classify the
quantitative as discrete or continuous and qualitative as nominal or ordinal:
a. Annual income (dollar)
b. Body temperature (degree Celsius)
c. White blood cells per deciliter of whole blood.
d. Presence of type II diabetes mellitus (yes or no)
e. Infant’s condition: Excellent, Good, and Poor

Q1. The following scores were obtained by 70 students in a Statistics Examinations
77 68 70 84 68 38 72 82 86 22
66 90 87 53 13 39 28 16 7 38
39 23 50 33 30 64 10 84 49 17
15 79 37 92 8 30 96 8 62 64
25 87 45 96 78 69 40 89 48 41
60 28 99 19 15 95 96 49 8 6
49 14 57 96 97 81 13 55 95 89
(a) Using Sturge’s Approximation, the number of classes K, of the above data is estimated to the nearest integer by the formula:
Use this to construct a grouped frequency distribution with the least lower limit of 5 for the data above.

(b) Draw a histogram for the distribution and use it to determine: (i) the mode
(ii) the three quartiles and hence an appropriate coefficient of skewness.

(c) Use the frequency distribution in (b) to calculate the:
(i) mean (ii) mode
(iii) median
(iv) standard deviation
(v) coefficient of variation

A problem of statistics is given to 3 students A,B & C whose chances of solving it are 1/2,1/3 & 1/4 respectively.what is the probabilty that the problem can be solved?

In an experiment involving a toxic substance, the probability that a white mouse will be alive for 10 hours is 7/10 , and the probability that a black mouse will be alive for 10 hours is 9/10. Find the probability that, at the of 10 hours:
A) At least ONE mouse will be alive

If a shipment of 30,000 batteries is assumed to have a lifetimes which are normally distributed with mean 360 days and standard deviation 25 days what percentage could be expected to last more than 365 days?

If a shipment of 30,000 batteries is assumed to have a lifetimes which are normally distributed with mean 360 days and standard deviation 25 days what percentage could be expected to last more than 365 days?

b) what percentage could be expected to last more than 180 days?

In a study , the average age of the male candidates who were affected in a disease, was 38.20 whereas the average age of the female subjects was calculated to 34.976 with the standard deviation of 156.91 and 116.16 in male and female respectively..

What conclusion can I draw from this finding?

How does probability relate to scientific statements?

What is the definiton of mean?

While shooting free throws on opposite hoops kobie was making every 4th shot while aaron was making every 6th shot if they both just made a shot at the same time?