The speeds (in mph) of 9 randomly selected cars passing a certain checkpoint are measured by radar. The results are shown below.  Answer the following questions based on this sample data set. 40        45        45        45        48        52        52        61       63 a) Find the mean.  [mean] b) Find the median.  [median]  c) Find the range.  [range]  d) Find the standard deviation.  [SD] e) Determine the IQR (interquartile range). [IRQ] f) Find the upper and lower fences.  lower fence = [lower] upper fence = [upper] g) Determine if there are any outliers in the data set. (List any outliers).  [outlier]

A market researcher randomly selects 100 homeowners under 55 years of age and 500 homeowners over 55 years of age. Which type of sampling is used?

Unless the offer is irrevocable, an offer can be revoked or withdrawn at any time before acceptance without liability.

When switching from 10× to 40× magnification, which microscope component are you changing?

Which of the following is NOT one of the elements necessary to the formation of all valid contracts?

Which part of a compound light microscope is the eyepiece that you look through and typically provides 10× magnification?

A 0.100 M solution of a weak acid, HA, has Ka = 1.8 × 10⁻⁵. Using the approximation [H₃O⁺] ≈ √(Ka × C), what is the approximate pH of the solution?

At 25°C, Kw = 1.0 × 10⁻¹⁴. A weak acid has Ka = 6.3 × 10⁻⁵. What is Kb for its conjugate base?

Equal volumes of 2.0 × 10⁻⁴ M Pb(NO₃)₂ and 2.0 × 10⁻⁴ M NaCl are mixed. After mixing, each concentration is diluted by half, so [Pb²⁺] = 1.0 × 10⁻⁴ M and [Cl⁻] = 1.0 × 10⁻⁴ M. For PbCl₂(s) ⇌ Pb²⁺(aq) + 2Cl⁻(aq), Ksp = 1.7 × 10⁻⁵. Will PbCl₂ precipitate?

A student overshoots the endpoint while titrating an unknown monoprotic acid with standardized NaOH. The student uses the larger NaOH volume in the calculation. How will this most likely affect the calculated acid concentration?