# Harmonic mean - math problems

#### Number of problems found: 110

• A frequency A frequency table of grades has five classes (A, B, C, D, F) with frequencies of and 2,14,13,8 and 1 respectively. Using percentages, what are the relative frequencies of the five classes?
• Average speed The car drove on one section of the highway for half an hour at a speed of 80 km/h. Then he reduced his speed to 60km/h. It went three-quarters of an hour at a speed of 60 km/h. What was the average speed of the car?
• Workshops The plant has three workshops. In the first workshop, produce 5 products/hour, in the second 8 products/hour, and in the third 7 products/hour. In the first workshop, they produced 240 products, in the second 400 and the third 350 products. Find the avera
• Two cables On a flat plain, 2 columns are erected vertically upwards. One is 7 m high and the other 4 m. Cables are stretched between the top of one column and the foot of the other column. At what height will the cables cross? Assume that the cables do not sag.
• Average speed The car drove from city A to city B at a 40 km/h and back to city A at a speed of 80 km/h. What was the average speed of the car?
• Statistical survey Write TRUE OR FALSE for each question: 1 Standard deviation is a measure of central location. 2. The most frequent observation in a data set is known as the mode. 3 The most passive method of data collection is observation. 4 Access time for secondary dat
• Weighted harmonic average Ten workers will do some work in 2 minutes, five workers in 10 minutes and three workers in 6 minutes. How many minutes per average worker per worker?
• Harmonic mean If x, y, z form a harmonic progression, then y is the harmonic mean of x and z. Find the harmonic mean of the numbers 6 and 5.
• Harmonic series Insert four members between 5/3 and 5/11 to form harmonic series (means).
• Insert 7 Insert five harmonic means between 3 and 18
• Insert 6 Insert four harmonic means between 3/7 and 3/19
• Insert 5 Insert five harmonic means between 1/2 and 1/26
• Harmonic HM example Find the harmonic mean of 4 and 8.
• Harmonic 4 The harmonic mean of -6 and 5.
• Harmonic mean Harmonic means of 6 and 12
• HP - harmonic progression 2 Compute the 16th term of the HP if the 6th and 11th term of the harmonic progression are 10 and 18 respectively.
• HP - harmonic progression Determine the 10th term of the harmonic progression 6,4,3,…
• Statistics quiz Fill in the missing word 1. in a data set, the mean, median and mode are measured of ________________ 2. "The manipulation of variables under controlled conditions"is the data collection method known as______________ 3. in a normal distribution, the area
• The leaves Karel would rake the leaves in the garden alone in 24 minutes, his younger brother would take 30 minutes. How long would they dig a garden, if Karel digs alone for 6 minutes and then his brother comes to his aid?
• Aircraft angines The two engines of the aircraft are enough to supply the fuel for five hours of operation. However, one of the engines has a malfunction and thus consumes one-third more fuel. How long can the plane be in the air before it runs out of fuel? After an hour

Do you have an exciting math question or word problem that you can't solve? Ask a question or post a math problem, and we can try to solve it.

We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...

Looking for calculator of harmonic mean?