You can see that only 3 answers are correct so get rid of the one that doesn't make sense then your down to 3 possible options. The average book is about 300 pages long so we can infer that 276 is the number of pages in the book. 35d is the number of pages per day because d is the variable. So knowing this information that leaves us with 35 being the amount of pages she has already read.
<span>The mean of a set of data is 148.87 and its standard deviation is 68.29. Find the z score for a value of 490.19 the z-score is given by: z=(x-</span>μ<span>)/</span>σ plugging in the values in the expression we get: z=(490.19-149.87)/68.29 z=340.32/68.29 z=4.9835