const averageSharePriceByMonthQ1 = [109.6, 103.3, 89.4]
const averageSharePriceByMonthQ2 = [109.3, 126.1, 103.3]
const averageSharePriceByMonthQ3 = [120.8, 102.3, 106.8]
const averageSharePriceByMonthQ4 = [110.9, 119.8, 113.7]

function findPriceExtremes(arr){
/*
Challenge:
2. Find the highest number from the array 
   and store it in the const 'highest'. 
3. Find the lowest number from the array 
   and store it in the const 'lowest'. 
*/
    const highest = //???
    const lowest = //???
    console.log(`The highest average share price was ${highest}`)
    console.log(`The lowest average share price was ${lowest}`)
}

/*
Challenge:
1. Call this function with one array holding 
   all of the data from the 4 arrays above.
*/
findPriceExtremes()