High School Statistics

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1

• 6

• 4.5

• 4

In a factory, the weight of the concrete poured into a mold by a machine follows a normal distribution with a mean of 1150 pounds and a standard deviation of 22 pounds. Approximately 95% of molds filled by this machine will hold weights in what interval?

• 1084 to 1216 pounds 

• 1106 to 1150 pounds 

• 1106 to 1194 pounds 

• 1128 to 1172 pounds

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.

• 24,000 km and 34,000 km.

• 26,000 km and 34,000 km.

• 27,000 km and 31,000 km.

Which interval shows 99.7% of the data given a mean of 15 and a standard deviation of 3?

• 9 to 21

• 12 to 18

• 6 to 24

• 13 to 16

The following are the scores of students in their statistics quiz 7,8,9,5,6,4,10. What is the population variance?

• 371

• 49

• 67

• 4

Five hundred tickets will be sold and these will be raffled during the town fiesta.  One of these tickets will win ₱10,000 and the rest will win nothing.  The cost of each ticket is ₱50.00.

What is the probability of losing if you buy a ticket?

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

• population parameter

• sample parameter

• sample statistic

• population mean

ball is drawn at random from a box containing 4 red balls, 5 white balls and 6 blue balls, what is the probability that the ball is a red ball?

• 1/7

• 2/15

• 4/15

• 1/15

Determine the level of measurement: Hourly wages of students in fast food.

• Nominal

• Ordinal

• Interval

• Ratio

The following are the scores of students in their statistics quiz 7,8,9,5,6,4,10. What is the population mean?

• 7

• 8

• 9

• 10