Statistics - practice problems - page 9 of 46
Number of problems found: 920
- A person
A person buys 10 kg of commodity A at a rate of 2 kg per dollar, 20 kg of commodity b at a rate of 5 kilograms per dollar, and 30 kg of commodity C at a rate of 10 kg per dollar. Find the average price of kg per dollar. - A biologist
A biologist knows that the average length of a leaf of a certain plant is 4 inches. The standard deviation of the population is 0.6 inches. A sample of 20 leaves of that type of plant given a new type of plant food had an average length of 4.2 inches. At - Employees - statistical
The company has 18 employees aged 26-52. The age groups of the employees are: 3 employees aged 52 years, 2 aged 32 years, 1 ... 26 years old, 5 ... 36 years old, 4 ... 45 years old, and 3 ... 50 years old. Determine the median. - Average spending
If Rina's cell phone bills for the past five months have been $91, $69, $74, $56, and $70, what was her average cell phone bill for the past five months? - Three sigma rule
Stomach weights are normally distributed, with a mean of 1314 g and a standard deviation of 113 g. State the probability that a randomly selected stomach weighs more than 1118 g. (Report the probabilities using at least four decimal places. ) - 45 percentile
Given the following data 11 15 24 33 10 35 23 25 40 What is P45? - Class height average
In the 8 A class, the average height of 12 girls is 156 cm, and the average height of 14 boys is 172 cm. Calculate the average number of students in 8 A. - Carp average weight
The fishery gradually sold carp weighing 2 1/2 kg, 1 5/6 kg, 1 3/5 kg, 2 1/10 kg, 2 kg, and 2 2/3 kg. What was the average weight of 1 carp? - A student 2 A student randomly selected 225 college students and asked whether they had eaten breakfast that morning before coming to campus. Fifty-seven students were at least 25 years old, and 30 had breakfast that morning. Of the 168 students younger than 25, 82 h
- Z-score
The mean adult male pulse rate is 67.3 beats per minute, with a standard deviation of 10.3. Find the z-score for an adult male's pulse rate of 75. (Round the z-score to two decimal places. ) - Bottles 5
Sections A 9 1/2, sections B 7 1/3, sections C 8 3/4. what is the average collection of bottles per section? - The size 2
The size of pants sold during one business day in a department store is 32, 38, 34, 42, 36, 34, 40, 44, 32, and 34. Find the average size of the pants sold. - Average score
In a math exam, two students scored 95, six students scored 90, 3 students scored 80, and one student scored 50. What was the average score for the class? - A plumber
A plumber has the following lengths of PVC: 3.3 ft, 9.77 ft, 8.41 ft, 9.61 ft, and 8 ft. What is his average length of PVC? - Range, mean, median
The ages of 7 employees in an office are given below 32, 42, 30, 32, 33, 23, 32 Find a) Range b) Mean c) Median - The average 3
The average of fractions is 7/10. One of the fractions is 2/3; the other fraction is? - Respondents - chi-square Asked respondents answered a question about their average net monthly wage. The given answers are in thousands €: 0.40; 0.60; 0.55; 0.68; 0.63; 0.70; 0.65; 0.75; 0.91; 0.63; 0.38; 0.39; 0.38; 0.74; 1.25; 1.10; 1.30; 1.15; 1.18; 1.13; 1.15; 1.19; 1.21. Usi
- Corresponding Suppose that the country has had the following inflation rates over the past 14 years: 6.0, 6.7, 10.4, 11.9, 7.2, 3.5, 8.4, 7.5, 2.8, 4.3, 1.9, 3.9, 0.9, 0.7. Use the χ² goodness-of-fit test to determine whether the random variable ξ corresponding to this
- Five number summary Find the five-number summary for these data and make a boxplot. 14,5,12,19,2,35,5,4,3,7,5,8
- Confidence interval
A food testing laboratory in Abu Dhabi has been commissioned to estimate the amount of olive oil contained in 1-gallon tins purchased from a range of international olive oil producers. The manufacturers state that the standard deviation of the amount of o
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