KSA Grade 10 Statistics and Probability. Practice it free.

Four small data sets are listed below. Which set has the least standard deviation?

Set A: $3, 7, 11, 15$
Set B: $6, 8, 10, 12, 14$
Set C: $8, 9, 10, 11, 12$
Set D: $4, 8, 12, 16, 20$

Five quiz scores are $82\textsf{,}$ $75\textsf{,}$ $90\textsf{,}$ $85\textsf{,}$ and $68\textsf{.}$ Which data set has the same mean?

The practice times, in minutes, for five days are $35\textsf{,}$ $15\textsf{,}$ $20\textsf{,}$ $40\textsf{,}$ and $25\textsf{.}$ Which data set has the same median?

Events $A$ and $B$ are independent, with $P(A) = \dfrac{1}{3}$ and $P(B) = \dfrac{1}{2}$. What is $P(A \mid B)$?

A student read $30$, $45$, $35$, $40$, $50$, and $25$ pages on six days of a reading challenge. On a seventh day, she read $x$ pages. The mean number of pages read per day over all seven days is $38$. What is the value of $x$?

A dot plot of quiz scores shows 4 dots above 8, 5 dots above 9, and 3 dots above 10. How many quiz scores are shown in all?

For a normal distribution, approximately what percent of data lies more than 2 standard deviations from the mean (counting both tails)? (Use the empirical rule; enter the number of percent.)

A cold front is expected to reduce a reservoir's algae volume by $\frac{3}{4}$ of its previous amount each week. The volume is $640$ cubic meters at the start of week $0$. Which equation models the algae volume $A(w)$, in cubic meters, after $w$ weeks?